2. (40pts) Suppose in the basic 5-stage pipeline with the sequence of instructions: or ri.r2.r3 or r2.r1.r4 or rl.rl.r2 Also, assume the following cycle times for each of the options related to forwarding Without Forwarding 250ps With Full Forwarding 300ps What is the total execution time of this instruction sequence without forwarding and with full forwarding? What is the speedup achieved by adding full forwarding to a pipeline that had no forwarding