Swapping _______ be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.$

Swapping _______ be done when a process has pending I/O, or has to exe

1.	Swapping _______ be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.$
A.	must
B.	can
C.	must never
D.	maybe
Answer» D. maybe