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_7, x_7 is rich. For all x_7, x_7 is a server or x_7 is a scientist. There is at least one x_7 for which if x_7 were a server, then x_7 is driving a car. For all x_7, if x_7 were a scientist, then x_7 is driving a car.
There is at least one x_7 for which x_7 will drive a car can be inferred via the existential disjunction elimination rule.