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_2, z_2 will play tennis. For all z_2, z_2 is a doctor. For all z_2, z_2 will drive a car.
For all z_2, z_2 will play tennis and z_2 is a doctor can be inferred via the universal conjunction rule. For all z_2, z_2 will play tennis and z_2 will drive a car can be inferred via the universal conjunction rule. For all z_2, z_2 is a doctor and z_2 will play tennis can be inferred via the universal conjunction rule. For all z_2, z_2 is a doctor and z_2 will drive a car can be inferred via the universal conjunction rule. For all z_2, z_2 will drive a car and z_2 will play tennis can be inferred via the universal conjunction rule. For all z_2, z_2 will drive a car and z_2 is a doctor can be inferred via the universal conjunction rule.