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_4, z_4 is a bartender or z_4 is a police officer. For all z_4, z_4 is not a police officer. There is at least one z_4 for which z_4 is not a bartender or z_4 is a carpenter.
There is at least one z_4 for which z_4 is a police officer or z_4 is a carpenter can be inferred via the existential resolution rule.