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: ~S_1(y). forall y: W(y) <-> S_1(y). t_4 -> W(c). forall y: W(y) -> S_1(y).
forall y: ~W(y) can be inferred via the universal modus tollens rule. forall y: W(y) -> S_1(y) can be inferred via the universal biconditional elimination rule. forall y: S_1(y) -> W(y) can be inferred via the universal biconditional elimination rule. forall y: ~W(y) can be inferred via the universal biconditional elimination rule.