Question: There are four concurrent processes W , X , Y and Z . All have a shared variable ' c ' . W and X

There are four concurrent processes W, X, Y and Z. All have a shared variable 'c'. W and X work as follow reads c from memory, increment by one, store c in memory. Y and Z work as follow reads c from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore s =2, what is the maximum value of c after all four processes complete execution?
Select one:
a.-1
b.1
c.2
d.-2

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