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A critical region is

  1. One which is enclosed by a pair of P and V operations on semaphores.
  2. A program segment that has not been proved bug-free.
  3. A program segment that often causes unexpected system crashes.
  4. A program segment where shared resources are accessed.
asked in Operating System by Boss (39.9k points) | 439 views

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A critical region is a program segment where shared resources are accessed.. that's why we synchronize in the critical section. That is D.

PS: It is not necessary that we must use semaphore for critical section access (any other mechanism for mutual exclusion can also be used) and neither do sections enclosed by P and V operations are called critical sections.
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