Counting based page replacement algorithms are not commonly used, because
A) they only approximate LRU.
B) they are expensive to implement, even though they incur the least number of page faults.
C)they do not approximate OPT replacement very well and their implementation is expensive.
D) they do not approximate OPT replacement very well, even though they are easy to implement.

Question

Quizplus · Accepted Answer

Counting based page replacement algorithms are not commonly used because they do not approximate the optimal (OPT) replacement strategy well and their implementation is expensive.

Counting Based Page Replacement Algorithms Are Not Commonly Used, Because