A first$-$cousin is the child of one's aunt or uncle. Choose the correct Prolog rule.

$()$ cousin$($X$,$ Y$)$ :$-$ uncle$($W$,$ X$),$ aunt$($Z$,$ X$),$ married$($W$,$ Z$),$ child$($W$,$ Y$).$

$()$ cousin$($X$,$Y$)$ :$-$ parent$($P$,$X$),$ parent$($P$,$ Y$),$ X $\backslash =$ Y$.$

$()$ cousin$($X$,$Y$)$ :$-$ parent$($P$,$X$),$ sibling$($P$,$ A$),$ A $\backslash =$ Y$.$

$()$ cousin$($X$,$ Y$)$ :$-$ grandparent$($G$1,$ X$),$ grandparent$($G$2,$ Y$),$ sibling$($G$1,$ G$2).$

$()$ cousin$($X$,$Y$)$ :$-$ parent$($P$1,$X$),$ parent$($P$2,$ Y$),$ sibling$($P$1,$ P$2),$ P$1\backslash =$ P$2.$a