Consider the following two threads of a process, to be run concurrently in a shared memory (all variables are shared between the two threads): Assume the following: a single-core system load and store are atomic (i.e. they start and finish without interruption) x is initialized to 0 before either thread starts, and x must be loaded into a register before being incremented (and stored back to memory afterwards). The following questions consider the final value of x after both threads have completed. a. State the upper and lower bounds of value of x when both threads have completed. Explain your answer. b. Suppose we replace 'x = x+2' in Thread B with an atomic double increment operation atomiclncr2(x) that cannot be preempted while being executed. What are ALL possible final values of x? Explain