Operating System (OS)
A critical region is

a program segment that has not been proved bug-free
a program segment where shared resources are accessed
none is the above
a program segment that often causes unexpected system crashes
one which is enclosed by a pair of P and V operations on semaphores

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Operating System (OS)
Under virtual storage,

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

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Operating System (OS)
A program

is the device where information is stored
is a device that performs a sequence of operations specified by instructions in memory.
is a sequence of instructions
is typically characterized by interactive processing and time of the CPU
None of these

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