Explanation

Explanation

Explanation

MP4 (MPEG-4 Part 14) is a widely used container format for transmitting streaming videos online.

It supports various codecs, including H.264, which is known for its efficient compression and compatibility with most devices. 

Why other options are incorrect:

AVI (Audio Video Interleave):

While AVI is a common video format, it's not as optimized for streaming as MP4.

It can be larger and less efficient for online delivery. 

WMA (Windows Media Audio):

WMA is primarily an audio format, not designed for video streaming. 

WAV:

WAV is a pure audio format used for high-quality recordings.

It's not suitable for streaming video. 

Explanation

Slide transitions are the effects that occur when you move from one slide to the next during a presentation.

You can control the speed, add sound, and customize the properties of transition effects.

Explanation

In Microsoft Word, when you insert a comment in a document, it appears in a "Balloon" on the side of the document.

This allows the comment to be easily seen without disrupting the main text.

Shortcut key to add a comment: Alt + ctrl + M 

Explanation

In Microsoft Windows 7, Gadgets are small applications that can display information.

Such as the weather, time, and system performance on your desktop.

They provide quick access to data without needing to open a full application

Explanation

Explanation

Explanation

A Trojan Horse is a type of malware that disguises itself as legitimate software.

A Virus is a type of malware that inserts itself into another program.

A worm is similar to a virus, except that it does not need a program in order to run.

Explanation

Full duplex mode allows communication in both directions simultaneously.

In contrast, half duplex mode permits communication in both directions, but not at the same time

Simplex mode allows communication only in one direction.