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Que. An operating system uses Shortest Remaining Time first (SRT) process scheduling algorithm. Consider the arrival times and execution times for the following processes:

Process Execution time Arrival time
P1 : 20 0
P2 : 25 15
P3 : 10 30
P4 : 15 45

What is the total waiting time for process P2?
a. 5
b. 15
c. 40
d. 55
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