Problem $4(10$ points$)$:

Examine the difficulty of adding a proposed ss rs $1,$ rs$2,$ imm $($Store Sum$)$ instruction to RISC$-$V$.$

a$)$ Interpretation: $\backslash (\backslash$operatorname$\{$Mem$\}[\backslash$operatorname$\{$Reg$\}[\backslash$mathrm$\{$rs$\}1]]=\backslash$operatorname$\{$Reg$\}[\backslash$mathrm$\{$rs$\}2]+\backslash$mathrm$\{$imm$\}\backslash )$

b$)$ Which new functional blocks $($if any$)$ do we need for this instruction?

c$)$ Which existing functional blocks $($if any$)$ require modification?

d$)$ What new signals do we need $($if any$)$ from the control unit to support this instruction?

e$)$ Modify the figure below to demonstrate an implementation of this new instruction. $($Just draw the modified part.$)$