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_6: W(x_6) -> P(x_6). forall x_6: P(x_6) -> W(x_6). forall x_6: P(x_6).
forall x_6: W(x_6) can be inferred via the universal modus ponens rule. exists x_6: W(x_6) <-> P(x_6) can be inferred via the existential biconditional introduction rule. exists x_6: P(x_6) <-> W(x_6) can be inferred via the existential biconditional introduction rule.