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