Question # $6$

An $81$ multiplexer has inputs $A,B,$ and $C$ connected to the selection inputs $S_2,S_1,$ and $S_0,$ respectively. The data inputs $I_0$ through $I_7$ are as follows:

$I_1=I_2=I_7=0$;$I_3=I_5=1$;$I_0=I_4=D$; and $I_6=D^{\text{'}},$

Determine the boolean function that this multiplexer implement.