Exercise 7.28 The pipelined ARM processor is running the following code snippet. Which registers are being written, and which are being read on the fifth cycle? Recall that the pipelined ARM processor has a Hazard Unit. MOV SUB LDR STR ORR R1, RO, R3, R4 , R2, #42 R1, #5 [R0 , #18] [R1,#63] RO, R3