Solution

The correct answer is D, A, E, B, C

Key PointsThe sequence of steps in a page replacement algorithm:

• D. No frame is free: Check if there are no free frames available.
• A. Find a frame that is not currently being used: If no free frame is available, identify a frame that can be replaced (one that is not currently in use).
• E. Free a frame: If a frame is found that is not currently being used, free this frame by writing its contents to disk if necessary.
• B. Change the page table: Update the page table to reflect the fact that the new page will be loaded into the freed frame.
• C. Use freed frame: Finally, use the freed frame to load the new page.

Thus, the correct sequence is D, A, E, B, C.