2. Which of the following does not cause an interruduld a. check for time quantum each time a process is sc b. system call c. /O completion d, power failure were completed maphore was initializedto 4. Then 28 waio operations and rocesses orations and 18 signal0 operations on this semaphore. What is the value of numo is the value of number of blocked processes? b 0 4 What policy is provably optimal with
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