[S points] For the following instruction sequence show the bubbles required to ensurs 4.53 r4. [See figures 4.53 reordering and without forwarding paths. Draw arrows representing the flow of r3 and and 4.58] and r3, rl, r2 1w r4, 10 (r3) sub r5, r4, rl RF IM 15 points] Repeat the exercise, but this time use all possible forwarding paths to speed up execution. RF DM RF IM DM IM