$(3)5.$ Use a K$-$map to find a minimal expansion as a Boolean sum$-$of$-$products of the

function, $xyz+x\frac{y}{b}ar(z)+\frac{x}{b}ar(y)z+\stackrel{}{x}\frac{y}{b}ar(z)+\stackrel{}{x}\frac{y}{b}ar(z)$ in the variables $x,y,z.$ Note: There is more than

one correct answer. You only need to express one of them, as stated in the phrase, $"$a

minimal expansion."