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: ~T_2(x_3). forall x_3: T(x_3) -> T_2(x_3). forall x_3: T_2(x_3) or ~T(x_3). forall x_3: T_2(x_3) -> T(x_3).
exists x_3: ~T(x_3) can be inferred via the existential modus tollens rule. forall x_3: T(x_3) -> T_2(x_3) can be inferred via the universal rewriting rule. forall x_3: T(x_3) <-> T_2(x_3) can be inferred via the universal biconditional introduction rule. forall x_3: T_2(x_3) <-> T(x_3) can be inferred via the universal biconditional introduction rule.