Given the following Prolog database entries: sibling(paul, ann). sibling(jim, jo). sibling (jim, jacob). son(bob, jane). son(tom, paul). son(bob, jim) nephew(X, Y): - son(X, Z), sibling(Z, Y). Explain whether the following queries succeed or fail, and state what each query returns if it succeeds. Please show how you arrive at your answer a. |?- nephew(U, jo). b. |?- nephew(tom, ann)