Explanation

Anti-virus software primarily serves to protect against malware and viruses

Its main functions include:

• Detecting and Removing Threats
• Real-Time Protection
• Preventing Future Infections:

Explanation

The file type .pdf is associated with Adobe Acrobat.

It is used for creating and viewing Portable Document Format files.

Explanation

The Esc key is usually used to escape from a particular environment or cancel an ongoing action. 

It allows users to exit menus, dialogs, or other modes without making changes.

Explanation

Page numbers can be inserted from the Insert menu.

This menu provides options to add page numbers, headers, footers, and other elements to your document.

Explanation

The default name of the first sheet in any workbook is Sheet1.

Excel assigns this name automatically.

It can be renamed by the user if desired.

Explanation

In Excel charts, the vertical axis is called the Y-axis.

The Y-axis typically represents values.

The horizontal axis is referred to as the X-axis.

The X-axis represents categories or time.

Explanation

The utility of Excel to fill columns or rows with a series of data is Auto Fill.

It allows users to quickly populate cells with a sequence or pattern based on the initial values entered.

Explanation

The area where text is entered, manipulated, and viewed is called the Document Window.

It is the primary workspace within a text editor or word processor where the user interacts with the document.

Explanation

The vertical dimension of a spreadsheet is called a Column.

Columns run from top to bottom and are identified by letters.

The horizontal dimension of a spreadsheet is called a Row.

Rows run from left to right and are identified by numbers.

Explanation

• The ".vob" file extension is not a valid MS Office document format.
• It is commonly associated with DVD video files.
• The other extensions listed (.docx, .pptx, .doc) are valid MS Office document formats for Word and PowerPoint files.