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_15, x_15 will take a plane or x_15 is a musician. For all x_15, x_15 will not take a plane. For all x_15, if x_15 were a musician, then x_15 is happy.
For all x_15, x_15 is a musician can be inferred via the universal disjunctive syllogism rule.