b$)$ Simplify the following using $k-$map

and realize the simplified expr ession

NAND gates only.

$F=A{B}^{\text{'}}{C}^{\text{'}}+A^{\text{'}}{B}^{\text{'}}{C}^{\text{'}}+A^{\text{'}}{B}^{\text{'}}+A^{\text{'}}{C}^{\text{'}}+A{C}^{\text{'}}.$

C$)$ State one main difference between

Von$-$Neumann Architecture and

Harvard Architechure.