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: If David drives a car, then Charles is a cashier. For all x_11, x_11 will drive a car and x_11 is a taxi driver.
For all x_11, x_11 will drive a car can be inferred via the universal simplification rule. For all x_11, x_11 is a taxi driver can be inferred via the universal simplification rule.