How to solve

Problem$\_$#$04]$ Use a Karnaugh map to find the simplified SOP expression for:

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

$($b$)AC(\frac{?}{\text{b}\text{a}\text{r}}(B)+C)$

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

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