Computers are used by large businesses, government agencies, and in science and education to provide centralized storage and processing and to manipulate tremendous amounts of data.

The answer to this question is the Mainframe Computer. Mainframe computers are used by large businesses, and government agencies because this computer can store large data and information. Mainframe basically known as a large cabinet because of its size and the frame stores the Central processing unit of the computer.  

solution:

the right option is a

to adding   a new row to a table we   have to do process last table cell and pressing tab.

this is the process to add new row in the cell:

* to add a row below the cell, click insert below in the rows and columns group.

thus this is the required right answer.