List FOUR different design considerations of multiprocessor operating system. Considering the following diagram, what would be the contents of MAR, MBR, PC and IR after the fetching of the next instruction. System bus MAR 140 MBR int c=a+b: CPU PC 150 IR int c= a+b; Address Bus Data Bus Control Bus Memory 100 main() 110 ( 120 int a 10; 130 int b=20; 140 int c= a+b; 150 print "c"; 160)