Question $17(1$ point$)$

$6$

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Select the Boolean expression that isnotsatisfiable.

$12$

$18$

$(x+y)(x+z)(y\frac{+}{b}ar(z))$

$(\frac{?}{\text{b}\text{a}\text{r}}(x+y))(x+z)(y\frac{+}{b}ar(z))$

$(\stackrel{}{x}\frac{+}{b}ar(y))(x+z)(y\frac{+}{b}ar(z))$

$(\frac{?}{\text{b}\text{a}\text{r}}(xy))(x+z)(y\frac{+}{b}ar(z))$