单选题：The copy-on-write mechanism provides:

The copy-on-write mechanism provides: @[D](1)
A. an efficient way to create new processes
B. a clever way to share virtual memory pages (at least temporarily)
C. a way to avoid unnecessary page copying
D. all of the above





A.an efficient way to create new processes
B.a clever way to share virtual memory pages (at least temporarily)
C.a way to avoid unnecessary page copying
D.all of the above


答案：D