Which of the following refers to too much electricity and may cause a voltage surge

............ is a Windows utility program that locates and eliminates unnecessary fragments and recharges files and unused disk space to optimize operations.

Which of the following refers to the rectangular area for displaying information and running programs

A(n)...........appearing on a web page opens another document when clicked. 

........... is the most important/powerful computer in a typical network.

The CPU comprises of Control, Memory, and .......... Units.