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: T_2(c) <-> p_12. forall x_4: S_1(x_4) -> T_2(x_4). p_12 -> ~t. t.
~p_12 can be inferred via the modus tollens rule. T_2(c) -> p_12 can be inferred via the biconditional elimination rule. p_12 -> T_2(c) can be inferred via the biconditional elimination rule.