you understand by multiprogramming or multitasking under operating system? (2 marks) 20 marks) Question 4 are the four main components of any general-purpose computer? (4 marks) tin) Suny s memory hierarchy concept important to memory designers? (3 marks) machine, A, executes a program with an average CPI of 1.9 and machine, B enhanced compiler), executes the same program uppose (with the same ins with 20% less instructions and with a CPI of 1.1 at 800M Iz In order for the two nchins to have the same performance, determine the value of the clock rate of the set and an first machine A. (6 marks) yst four devices that use processor as part of its component. (4 marks) v) The tional forms of RAM used in computers are DRAM and SRAM. State two differences between DRAM and SRAM. (3 marks) 120 marks