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_4, if x_4 plays tennis, then x_4 is taking a plane. For all x_4, x_4 will drink water. For all x_4, x_4 will play tennis.
For all x_4, x_4 will take a plane can be inferred via the universal modus ponens rule. For all x_4, x_4 will drink water and x_4 will play tennis can be inferred via the universal conjunction rule. For all x_4, x_4 will play tennis and x_4 will drink water can be inferred via the universal conjunction rule.