There are four concurrent processes $W,x,Y$ and $Z$ sequence. All have a shared variable $\text{'}C\text{'}.W$ and X work as follow feads efrom 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 semaphores before reading, and calls signal after storing. If semaphore $s=1,$ what is the maximum value of c after all four piocesses complete execution?

sectect one:

a$.2$

b$.-2$

c $-1$

d$.1$