Choose the correct alternatives (more than one...

Choose the correct alternatives (more than one may be correct) and write the corresponding letters only:

At a particular time of computation, the value of a counting semaphore is 7. Then 20P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is :

A. 42
B. 7
C. 12
D. 2
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