Mail merge is a feature within most data processing applications that enables users to send a similar letter or document to multiple recipients. It enables connecting a single form template with a data source that contains information about the recipient's name, address and other predefined and supported data.

Mail merge lets you create a batch of documents that are personalized for each recipient. For example, a form letter might be personalized to address each recipient by name. A data source, like a list, spreadsheet, or database, is associated with the document.

Mail Merge types:-

Mail Merge requires three types of documents: (a) Main Document, (b) Data Source, and (c) Merge Document. (a) Main Document: In a Mail Merge operation, the personalized document (such as, a standard letter, or envelope, or mailing label) is known as the main document.

Steps of Mail Merge:-

Mail merging means to plug data from an address table into form letters, e-mail messages, envelopes, address labels, or a directory (a list or catalog, for example). To start a mail merge, choose Tools | Letters and Mailings | Mail Merge Wizard to open the Mail Merge task pane.

The advantages of Mail Merge are as follows:

• The Mail Merge feature makes it easy to send the same letter to a large number of people.
• By using Mail Merge, we don't have to type each recipient's name separately in each letter.
• We need to proofread only the main document.
• It is economical and saves a lot of time.

Hence, correct option is D.

 MS -Word:  Microsoft Word is a word processing program that allows for the creation of both simple and complex documents. With Office 365, you are able to download the application to your hard drive and will also have access to the online version.

Tabular data formatting software: Tabular format" is simply information presented in the form of a table with rows and columns. Most office productivity software programs, such as word processors and spreadsheets, include tools for entering text and data in tabular format. Most commonly used software is MS - Excel.

Word processing software:  A word processor is a device or computer program that provides for input, editing, formatting, and output of text, often with some additional features. Early word processors were stand-alone devices dedicated to the function, but current word processors are word processor programs running on general purpose computers.  Most commonly used software is MS - Word..

Presentation Software:  In computing, a presentation program (also called presentation software) is a software package used to display information in the form of a slide show. It has three major functions: an editor that allows text to be inserted and formatted. a method for inserting and manipulating graphic images and media clips. Most commonly used software is MS - Power Point.

E-mail client:  An email client, email reader or, more formally, message user agent (MUA) or mail user agent is a · A · Like most client programs, an email client is only active 

Hence correct answer is option B

WRD: In linguistics, a word of a spoken language can be defined as the smallest sequence of phonemes that can be uttered in isolation with objective or practical meaning.

TXT:  the original words and form of a written or printed work. (2) : an edited or emended copy of an original work. b : a work containing such text. 2a : the main body of printed or written matter on a page. b : the principal part of a book exclusive of front and back matter.

DOC:The definition of doc is a slang word which is short for doctor and document. An example of a doc is a typed file on your computer. ... A nickname for a medical doctor, a person with an advanced educational degree, or a learned person.

FIL: A computer file is a computer resource for recording data in a computer storage device, primarily identified by its file name. Just as words can be written to paper, so can data be written to a computer file. Files can be edited and transferred through the Internet on that particular computer system.

Hence correct answer is option C