Solution

The correct answer is option 4.

Key Points

3 pages of physical memory mean 3 frames (so at a time only max 3 pages in  frames)

5 pages of  virtual memory mean 5 page

 FIFO (First In, First Out)
    The operating system uses this algorithm to keep track of all pages in memory in a queue, with the oldest page at the top. When a page has to be replaced, the first page in the queue is chosen for replacement.

Page faults= A B C  D A  B E  C D  B A 

Page faults= 11

Least Recently Used –
   In this algorithm, the page will be replaced which is the least recently used.

Page faults=  A B C D A B E C D E B A

Page faults= 12

∴ Hence the correct answer is (11, 12).