a$)$ Express the following function as summation of Minterms and product of Maxterms F$($A$,$B$.$C$,$D$)=$B$\text{'}$D$+$A$\text{'}$D$+$ BD

b$)$

Simplify the following function A$\text{'}$C$\text{'}+$ABC$+$AC$\text{'}$