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_8: Q_2(x_8) or P_3(x_8). forall x_8: P_3(x_8) <-> P_8(x_8). forall x_8: P_8(x_8) <-> Q_2(x_8).
forall x_8: P_3(x_8) -> P_8(x_8) can be inferred via the universal biconditional elimination rule. forall x_8: P_8(x_8) -> Q_2(x_8) can be inferred via the universal biconditional elimination rule. forall x_8: P_8(x_8) -> P_3(x_8) can be inferred via the universal biconditional elimination rule. forall x_8: Q_2(x_8) -> P_8(x_8) can be inferred via the universal biconditional elimination rule.