a.

1.Initial value of the counters — 0.

2.Counters are increased — whenever a new page is associated with that frame.

3.Counters are decreased — whenever one of the pages associated with that frame is no longer required.

4.How the page to be replaced is selected — find a frame with the smallest counter. Use FIFO for breaking ties.

b.13 page faults

c.11 page faults