Consider again the datapath in Figure $1$ and the program code in Listning $1$ on the last page. For each of the code lines $4$ and $7,$ when Inst has the corresponding machine code value of these code lines, state the values of the eight signals marked as black filled circles. If the signal has a uniquely defined value, $($independent of the loop iteration$)$ state that value as a hexadecimal number. If the value is always located in a specific register, $($e$.$g$.,$$t$0)$ then state the register name $($e$.$g$.,$ $t$0).$ Otherwise, state that the signal value is unknown. Figure $1.$Listning $1.$