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: P_8(x_8) or T(x_8). forall x_8: T(x_8) <-> U_3(x_8). forall x_8: ~P_8(x_8).
exists x_8: T(x_8) can be inferred via the existential disjunctive syllogism rule. forall x_8: T(x_8) -> U_3(x_8) can be inferred via the universal biconditional elimination rule. forall x_8: U_3(x_8) -> T(x_8) can be inferred via the universal biconditional elimination rule.