Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage
interprogram interference may occur
a single program is processed by two or more CPUs
None of these

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Operating System (OS)
Memory management is :

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

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