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, if x_10 were fast, then x_10 is a police officer. If James were a nurse, then Robert is not a police officer. For all x_10, x_10 is fast.
For all x_10, x_10 is a police officer can be inferred via the universal modus ponens rule.