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_6, if x_6 were excited, then x_6 is not a server. For all x_6, if x_6 drives a car, then x_6 is a server. For all x_6, x_6 will write a letter or x_6 will drive a car. For all x_6, if x_6 climbs a mountain, then x_6 is a server. For all x_6, x_6 will not write a letter or x_6 will climb a mountain.
For all x_6, x_6 will drive a car or x_6 will climb a mountain can be inferred via the universal resolution rule.