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: There is at least one x_16 for which if x_16 were happy, then x_16 is not a server. For all x_16, if x_16 drives a car, then x_16 is a server. For all x_16, x_16 will drink water. For all x_16, if x_16 drinks water, then x_16 is listening to a song. For all x_16, x_16 will drive a car if and only if x_16 will listen to a song.
For all x_16, x_16 will listen to a song can be inferred via the universal modus ponens rule. For all x_16, if x_16 drives a car, then x_16 is listening to a song can be inferred via the universal biconditional elimination rule. For all x_16, if x_16 listens to a song, then x_16 is driving a car can be inferred via the universal biconditional elimination rule.