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_8, if x_8 were a server, then x_8 is taking a plane. For all x_8, x_8 will drive a car or x_8 is a server. For all x_8, if x_8 were a doctor, then x_8 is not taking a plane. There is at least one x_8 for which x_8 is a doctor or x_8 is a soldier. For all x_8, if x_8 drives a car, then x_8 is taking a plane.
For all x_8, x_8 will take a plane can be inferred via the universal disjunction elimination rule.