For the next few questions, examine the following code: 1 ADD X1, X2, X3 2 SUB X2, X1, X5 3 LDUR X8, [X5, 0] 4 ADD X7, X8, X6 Assuming hardware hazard detection and no forwarding hardware, what is the CPI of this code (you may assume that this is in the middle of a long string of instructions so initial pipeline fill time is 0).