(a) Computer has input and output (I/O) units. The I/O units are the third element of the computer system besides CPU and memory. All computer systems must have efficient means to receive input and deliver output. At one time, a scanner, a mouse and a printer are sending an interrupt signals to the processor. i) Determine THREE (3) techniques to be used by the processor to overcome the problem. [6 Marks] ii) From the answer in i), analyze which is the best technique to be used by the processor in the situation above. Give a reason to justify your answer. [4 Marks]