$(30$ pts$)$ As discussed in the lectures on subroutine calls, answer each of following questions pertaining to lecture note page $132.$

a$)$ Explain all the changes to registers and memory due to step $3.$

b$)$ Explain all the changes to registers and memory due to step $4.$

c$)$ Explain all the changes to registers and memory due to step $5.$

d$)$ Explain all the changes to registers and memory due to step $10.$

e$)$ Explain all the changes to registers and memory due to step $13.$

f$)$ What is the purposed of using a Frame Pointer?