Let there be two processes A and B. A is used for the user to enter two values x and y, as well as to print the result of a function f(x,y), while B is used to calculate this function. If these processes are executed in parallel, who is the minimum number of semaphores required to synchronize correctly? a) 0. No semaphore is needed, processes will execute correctly anyway. b) 1 c) 2 d) 3