Operating systems

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Four processes A, B, C, and D are started at time 0 and all are in the running state. The following things happen at the following times:

  1. At time 5, process A performs a read operation on disk 1.
  2. At time 10, process B performs a read operation on disk 2.
  3. At time 12, process C perform a read operation on disk 3.
  4. At time 14, disk 1  interrupts and returns data.
  5. At time 16, disk 3 interrupts and returns data.
  6. At time 18, process A performs a write operation on disk 1.
  7. At time 21, process C terminates.

At time 25, assuming no other disk operation or disk interrupt has occurred, what is the statement of each of the four processes: ready/running, blocked, or terminated?

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