What is required when more than one person uses a central computer at the same time?

A. Light pen

B. Mouse

C. Digitizer

D. Terminal

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. A number that is used to control the form of another number is known as
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  20. People often call ______ as the brain of computer system
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