What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall y: W(y) or ~Q_2(y). forall y: W(y) <-> Q_2(y).
forall y: Q_2(y) -> W(y) can be inferred via the universal rewriting rule. forall y: W(y) -> Q_2(y) can be inferred via the universal biconditional elimination rule. forall y: Q_2(y) -> W(y) can be inferred via the universal biconditional elimination rule.