Acomputer consists of a cpu and an i/o device d connected to main memory m via a shared bus with a data bus width of one word. the cpu can execute a maximum of 106 instructions per second. an average instruction requires five processor cycles, three of which use the memory bus. a memory read or write operation uses one processor cycle. suppose that the cpu is continuously executing "background" programs that require 95% of its instruction execution rate but not any i/o instructions. assume that one processor cycle equals one bus cycle. now suppose that very large blocks of data are to be transferred between m and d.