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: It is late if and only if James is driving a car. If it is late, then James is driving a car.
If it is late, then James is driving a car can be inferred via the biconditional elimination rule. If James drives a car, then it is late can be inferred via the biconditional elimination rule.