单选题：Consider a page reference string for a process with M frames, in

Consider a page reference string for a process with M frames, initially all empty. The page reference string is of length P with N distinct page numbers in it.
What is a lower bound on the number of page faults? @[B](1)
A. M
B. N
C. P
D. zero




A.M
B.N
C.P
D.zero


答案：B