The $81$ multiplexer shown in the figure implements:

a$.F(A,B,C)=(0,1,4)$

b$.F(A,B,C)={\displaystyle \underset{?}{\overset{?}{}}}(0,1,4,5)$

c$.F(A,B,C)=(2,3,6,7)$

d$.F(A,B,C)={\displaystyle \underset{?}{\overset{?}{}}}(2,3,6,7)$

e$.$ None