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: W_2(c_4) <-> t. forall y: W(y) or W_2(y). forall y: ~W(y) or U(y). ~t.
W_2(c_4) -> t can be inferred via the biconditional elimination rule. t -> W_2(c_4) can be inferred via the biconditional elimination rule. ~W_2(c_4) can be inferred via the biconditional elimination rule. forall y: W_2(y) or U(y) can be inferred via the universal resolution rule.