$($a$)$ Implement the function:

$f\frac{?}{b}=ar(A+(\frac{?}{\text{b}\text{a}\text{r}}(C)))*(Bo+D)\frac{+}{b}ar(A)*B\frac{*}{b}ar(D)+$

$A*B\frac{*}{b}ar(C)\frac{*}{b}ar(D)\frac{+}{b}ar(A+(\frac{?}{\text{b}\text{a}\text{r}}(C)))\frac{*}{b}ar(B*D)$

using a minimum number of AND, OR $($with any number of inputs$)$ and NOT gates. You should write the equation only, a circuit is not Required.

$($b$)$ Implement the function using a $3-8$ line decoder and any other additional combinational logic that might be required.