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 z, z is a bartender. For all z, if z were a carpenter, then z is not a bartender. For all z, z is a carpenter or z will read a book.
For all z, z is not a carpenter can be inferred via the universal modus tollens rule.