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: u_1. R_25(d_3). forall x_25: R_25(x_25) -> S_25(x_25).
u_1 and R_25(d_3) can be inferred via the conjunction rule. R_25(d_3) and u_1 can be inferred via the conjunction rule. exists x: R_25(x) can be inferred via the existential generalization rule.