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: Jessica is not making tea. For all x_21, x_21 will make tea or x_21 will read a book. David is not a server. If Linda drinks water, then David is a server.
Linda is not drinking water can be inferred via the modus tollens rule. Jessica is not making tea and David is not a server can be inferred via the conjunction rule. David is not a server and Jessica is not making tea can be inferred via the conjunction rule.