Assume that in a single-processor system, at time 5 no system resources are being used except for the processor and memory. Also, assume that the system currently has 3 processes. Now consider the following events: At time 5: P, executes a command to read disk unit 1. At time 25: P2's time slice expires. At time 28: P3 executes a sleep command. At time 33: P1's read is complete. At time 38: P2 executes a command to create a thread. At time 40: P2's thread has been created. At time 45: P2's time slide expires. At time 48: P, executes a computing command. At time 50: P3's sleep time expires. At time 52: P, terminates. a. At time 30, which state each process is in. P1 : P2 P3: b. At time 39, which state each process is in. P1 : ; P2i. ; Pz: c. At time 51, which state each process is in. P: 3 P2 3 P3: _