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: R(x) -> S(x). forall x: U(x) -> R(x). forall x: S(x) <-> U(x).
forall x: U(x) -> S(x) can be inferred via the universal transitivity rule. forall x: S(x) -> U(x) can be inferred via the universal biconditional elimination rule. forall x: U(x) -> S(x) can be inferred via the universal biconditional elimination rule.