Which of the following does not support more than one program at a time?

Which of the following does not support more than one program at a time?

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1) In which type of the following OS, the response time is very crucial.

2) Bringing a page into memory only when it is needed, this mechanism is called

3) Which of the following windows version support 64 bit processor?

4) The shortcut key to open a task manager is:

5) Which of the following is not a multitasking operating system?