In regards to memory management, which is a correct definition?

A.
Page (frame) is the smallest unit of memory that the memory manager handles (allocates or
deallocates) at one time.

B.
Page fault is a method of managing locked memory.

C.
Swap is a reference to a logical page that is not currently in physical memory.

D.
Paging is the process used in telecommunication applications to inform the users that memory
is in short supply.