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_9, x_9 will drive a car or x_9 is not a mechanic. For all x_9, if x_9 drives a car, then x_9 is a mechanic. There is at least one x_9 for which if x_9 drives a car, then x_9 is a mechanic.
For all x_9, if x_9 were a mechanic, then x_9 is driving a car can be inferred via the universal rewriting rule.