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: 1. a single-core system 2. load and store are atomic (i.e. they start and finish without interruption) 3. x is initialized to 0 before either thread starts, and 4. 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. 1b Suppose we replace 'x = x + 2' in Thread B with an atomic double increment operation atomiclncr 2(x) that cannot be preempted while being executed. What are ALL possible final values of x? Explain