Given below are two statements: one is labelled as Assertion A and the other is labelled as

Reason R . A virtual memory system uses first-in first-out page replacement policy and allocates a fixed number of frames to a process

Assertion A: Increasing number of page frames allocated to a process sometimes increases the page fault rate.

Reason R: Some programs do not exhibit locality of reference. In the light of the above statements, choose the correct answer from the options given below.

1. ABoth A and R are true and R is the correct explanation of A
2. BBoth A and R are true but R is NOT the correct explanation of A
3. CA is true but R is false
4. DA is false but R is true

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: B. Both A and R are true but R is NOT the correct explanation of A

Explanation

With FIFO, adding frames can increase page faults (Belady's anomaly), so A is true. R is also true, but the anomaly comes from FIFO not being a stack algorithm, not from lack of locality.