Question $7$

A nephew is the son of one's sibling. Choose the correct Prolog rule.

$()$ nephew$($X$,$Y$)$ :$-$ parent$($W$,$ X$),$ grandparent$($W$,$ Y$),$ male$($X$).$

$()$ nephew$($X$,$Y$)$ :$-$ parent$($Z$,$ X$),$ parent$($Z$,$ W$),$ sibling$($X$,$ W$),$ X $\backslash =$ W$.$

$()$ nephew$($X$,$Y$)$ :$-$ male$($X$),$ parent$($Z$,$ X$),$ sibling$($W$,$ Y$),$ W $\backslash =$ Z$.$

$()$ nephew$($X$,$Y$)$ :$-$ brother$($X$,$ Z$),$ parent$($Z$,$ Y$).$

$()$ nephew$($X$,$Y$)$ :$-$ male$($X$),$ parent$($W$,$ X$),$ sibling$($W$,$ Y$),$ W $\backslash =$ Y$.$