Discuss the two historically dominant architectural philosophies of CPU design:

a. Define the acronyms CISC and RISC and explain the fundamental differences between the two philosophies.

b. Name one commercial computer architecture that exemplifies the CISC architectural approach and one other that exemplifies RISC characteristics.

c. For each of the two architectures you named in (b), describe one distinguishing characteristic not present in the other architecture that clearly shows why one is considered a RISC and the other a CISC.

d. Name and explain one significant advantage of RISC over CISC and one significant advantage of CISC over RISC.