Fill in the Missing Step in the Following Deadlock Situation

question 16

Multiple Choice

Fill in the missing step in the following deadlock situation. Two users from the local board of education are each running a program (P1 and P2) , and both programs will eventually need two tape drives to copy files from one tape to another. Only two tape drives are available and they're allocated on an "as requested" basis. Soon the following sequence transpires: 1. P1 requests tape drive 1 and gets it.
2) ____
3) P1 requests tape drive 2 but is blocked.
4) P2 requests tape drive 1 but is blocked.

• A) P1 requests tape drive 2.
• B) P2 requests tape drive 2 and gets it.
• C) P2 requests tape drive 1 but is blocked.
• D) P1 releases tape drive 1.