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_16: Q_11(x_16). forall x_16: T(x_16) -> U_4(x_16). forall x_16: U_4(x_16). forall x_16: U_4(x_16) -> T(x_16).
forall x_16: T(x_16) can be inferred via the universal modus ponens rule. exists x_16: Q_11(x_16) and U_4(x_16) can be inferred via the existential conjunction rule. exists x_16: U_4(x_16) and Q_11(x_16) can be inferred via the existential conjunction rule. forall x_16: T(x_16) <-> U_4(x_16) can be inferred via the universal biconditional introduction rule. forall x_16: U_4(x_16) <-> T(x_16) can be inferred via the universal biconditional introduction rule.