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: exists x_3: Q(x_3) <-> T(x_3). forall x_3: U_4(x_3) -> T(x_3). forall x_3: ~Q(x_3).
exists x_3: Q(x_3) -> T(x_3) can be inferred via the existential biconditional elimination rule. exists x_3: T(x_3) -> Q(x_3) can be inferred via the existential biconditional elimination rule. exists x_3: ~T(x_3) can be inferred via the existential biconditional elimination rule.