Problems in this exercise refer to the following instruction sequences: I1: ADD R1, R2, R1 I2: LW R2, 0(R1) I3: LW R1, 4(R1) I4: OR R3, R1, R2 1) Find all data dependences in this instruction sequence. 2) Find all hazards in this instruction sequence for a 5-stage pipeline with and then without forwarding. 3)To reduce clock cycle time, we are considering a split of the MEM stage into two stages. Find all hazards in this instruction sequence for this 6-stage pipeline with and then without forwarding.