5. Answer the following questions about the critical region A. What is the critical region? B. What is the primary difference between the code within the critical region and the rest of a program? C. Describe how each of the following locking mechansms can be used to control access to the crtcal region 1. Test-and-Set 2. WAIT and SIGNAL 3. Semaphores D. What would happen if access to the crtical region was not controlled using one of the above locking mechanisms