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_2, x_2 is sad or x_2 will not drive a car. For all x_2, x_2 is happy or x_2 will drive a car. There is at least one x_2 for which if x_2 were happy, then x_2 is sad.
For all x_2, if x_2 drives a car, then x_2 is sad can be inferred via the universal rewriting rule.