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: Q(c) -> R_2(c). forall x: Q(x) -> R_2(x). forall x: R_2(x) -> Q(x).
forall x: Q(x) <-> R_2(x) can be inferred via the universal biconditional introduction rule. forall x: R_2(x) <-> Q(x) can be inferred via the universal biconditional introduction rule.