4. For each scenario, assume each block of code is executed by different processors (P1 or P2) that are working concurrently without synchronization. Furthermore, each block of code refers to non-shared variables (a or b) and a shared variable (x). Finally, if P1 and P2 execute their respective blocks of code only pnce, at any speed, determine all of the possible values of the shared variable x (assumex is initialized to 0). A. Scenario 1 B. Processor P1 Processor P2 C. for(a = 1; a