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 x_3: S(x_3) <-> Q(x_3). t <-> q. ~Q(c_4). S(c_4) <-> t.
t -> q can be inferred via the biconditional elimination rule. S(c_4) -> t can be inferred via the biconditional elimination rule. q -> t can be inferred via the biconditional elimination rule. t -> S(c_4) can be inferred via the biconditional elimination rule. forall x_3: S(x_3) -> Q(x_3) can be inferred via the universal biconditional elimination rule. forall x_3: Q(x_3) -> S(x_3) can be inferred via the universal biconditional elimination rule.