Operating System (OS)
A relocate program form is one which

can itself performs the relocation of its address-sensitive portions.
consists of a program and relevant information for its relocation.
All of these
cannot be made to execute in any area of storage other than the one designated for it at the time of its coding or translation.
None of these

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Operating System (OS)
A critical region is

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

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