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_13, if x_13 were a server, then x_13 is drinking water. For all x_13, if x_13 drinks water, then x_13 is a police officer. For all x_13, x_13 is a server. For all x_13, x_13 is a scientist.
For all x_13, x_13 will drink water can be inferred via the universal modus ponens rule. For all x_13, if x_13 were a server, then x_13 is a police officer can be inferred via the universal transitivity rule. For all x_13, x_13 is a server and x_13 is a scientist can be inferred via the universal conjunction rule. For all x_13, x_13 is a scientist and x_13 is a server can be inferred via the universal conjunction rule.