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
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  15. The basic operations performed by a computer are
  16. Second Generation computers were developed during
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  18. Who invented the high level language C?
  19. Which of the following programming language started from second generation?
  20. Which of the following is not a micro computer?
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  23. in which year was UK's premier computing event started?
  24. What is the main difference between a mainframe and a super computer?
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  27. The first microprocessor built by the Intel corporation was called
  28. What is a light pen?
  29. A stand-alone system which produces one page of printed output at a time is
  30. ________ refers to electronic trespassing or criminal hacking.