Explanation

Paper setting allows us to check the type of paper and type of toner to use while printing other settings.

Print Preview shows us what our print would physically look like on the paper.

Explanation

1.       Modeless

2.       Modal

3.       System modal

Explanation

Hyphen (-)

Ctrl + P is used to print a document

By default, our documents are printed in portrait-oriented mode.

Explanation

Firewall also prevents unauthorized access.

Explanation

 A real-time operating system  is an operating system  intended to serve real-time applications that process data as it comes in, typically without buffer delays. 

Explanation

Operating System: system software that manages computer hardware & software resources.

Explanation

The link pointer looks like a hand with a pointing finger.

The link pointer will only show up when there is a link to follow.

Explanation

Ctrl+H is used to find and replace text in a file.

Explanation

 Landscape is a horizontal orientation mode used to display wide-screen content, such as a Web page, image, document or text.

Explanation

Table in database must have a primary key.