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: For all x_10, x_10 is sad and x_10 will cook. For all x_10, x_10 is fast. For all x_10, if x_10 drives a car, then x_10 is not fast. For all x_10, x_10 will drive a car or x_10 is rich.
For all x_10, x_10 will not drive a car can be inferred via the universal modus tollens rule. For all x_10, x_10 is sad can be inferred via the universal simplification rule. For all x_10, x_10 will cook can be inferred via the universal simplification rule.