a$.$ Simplify the given expression using De Morgan's theorems and other Boolean rules. $(15$ marks$)$

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

b$.$ Compare the simplification of Boolean expressions using Boolean Algebra and K$-$Maps, and suggest the preferred method.

$(10$ marks$)$ Whech one is