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_2, if x_2 goes running, then x_2 is not sad. There is at least one x_2 for which if x_2 plays tennis, then x_2 is sad. For all x_2, x_2 will play tennis.
There is at least one x_2 for which x_2 is sad can be inferred via the existential modus ponens rule.