Consider the following instruction:

Instruction: AND Rd$,$ Rn$,$ Rm

Interpretation: $\backslash (\backslash$operatorname$\{$Reg$\}[\backslash$mathrm$\{$Rd$\}]=\backslash$operatorname$\{$Reg$\}[\backslash$mathrm$\{$Rn$\}]\backslash )$ AND $\backslash (\backslash$operatorname$\{$Reg$\}[\backslash$mathrm$\{$Rm$\}]\backslash )$

$($a$)$ What are the values of control signals generated by the control in COD Figure $4\mathrm{.}10($The datapath for the memory instructions and the R$-$type instructions$)$ for this instruction?

$($b$)$ Which resources $($blocks$)$ perform a useful function for this instruction?

$($c$)$ Which resources $($blocks$)$ produce no output for this instruction? Which resources produce output that is not used? Figure $4\mathrm{.}3\mathrm{.}4$: The datapath for the memory instructions and the R$-$type instructions $($COD Figure $4\mathrm{.}10).$

This example shows how a single datapath can be assembled from the pieces in COD Figures $4\mathrm{.}7($The two elements needed to implement R$-$format ALU operations $...)$ and $4\mathrm{.}8($The two units needed to implement loads and stores $...)$ by adding multiplexors. Two multiplexors are needed, as described in the example.