The following pair of processes share a common variable X.   Process A int Y; A1: Y = X*2; A2: X = Y;      Process B int Z; B1: Z = X+1; B2: X = Z; X is set to 5 before either process begins execution. As usual, statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. How many different values of X are possible after both processes finish executing? a) two b) three c) four d) eight

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