What is the full foarm of computer and cpu​

I studied it in 3rd standard so I don't remember much. As much as I can remember CPU means Computer Programming Unit. Computer doesn't have a full form it is a simple word that means something that computes or calculates.

CPU stands for Central Processing Unit. It is also known as a brain of the computer. It carries out instructions and computer programs and performs all the basic arithmetical and logical operations.

Explanation:

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; no longer than a reasonable period of time;