Which one of the following prolog programs correctly

Question

Which one of the following prolog programs correctly implement "if G succeeds then execute goal P else execute goal q ?"

(A) if-else (G, P, q) :- !, call(G), call(P).

if-else (G, P, q) :- call(q).

(B) if-else (G, P, q) :- call(G), !, call(P).

if-else (G, P, q) :- call(q).

(C) if-else (G, P, q) :- call(G), call(P), !.

if-else (G, P, q) :- call(q).

(D) All of the above