4. (30 points) Consider using MIPS pipeline that execute the following program ADD R3, R3, R3 SUB R4, R6, R5 AND R6, R3, R7 OR R8, R3, R9 a. Assume MIPS is not supported with forwarding mechanism. Would the pipeline require to be stalled during the processing of the above instructions? Show your answer on the diagram below b. Assume MIPS is supported with forwarding mechanism. Would the pipeline need to be stalled? You may use a diagram similar to the one below to support your answer c. Assume MIPS is processing the following program: LW R1, 200(R2) SUB R1, R1, R Also assuming the forwarding mechanism is supported with MIPS. Does the MIPS pipeline need to be stalled during the execution of the above program? below. IM Reg HALU Add R3, R3, R3 Sub R4, R6, R5 AND R6, R3, R7 DM OR R8, R3, R9