2. For the problems in this exercise, assume that there are no pipeline stalls and that the breakdown of executed instructions is as follows: add addi notbeq lw 20%| 20%10% 10% In what fraction of all cycles is the data memory used? In what fraction of all cycles is the input of the sign-extend circuit needed? What is this circuit doing in cycles in which its input is not needed? 25% | 25%