Implement the function given below in the two ways specified:

$f(A,B,C)={\displaystyle \underset{?}{\overset{?}{}}}m(0,3,4,7)$

a$.$ Implement the function using an $8-$to$-1$ multiplexor $($shown in the figure below$).$ Assume that you can connect any of the multiplexor's inputs to the function's variables, $A,B,$ and C $,$ or to a binary $\text{'}1\text{'}$ or $\text{'}0\text{'}$ value.

b$.$ Implement the function using a $3-$to$-8$ decoder $($shown in the figure below$)$ and an OR gate $($with as many inputs as you need$).$