Operating System (OS)
A development strategy whereby the executive control modules of a system are coded and tested first, is known as

None of these
Top-down development
Left-Right development
Bottom-up development
All of these

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Operating System (OS)
Memory management is :

critical for even the simplest operating systems
not used in modern operating system
not used on multiprogramming systems
None of these
replaced with virtual memory on current systems

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