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: John is driving a car if and only if it is sunny. For all z, z will not drive a car.
If John drives a car, then it is sunny can be inferred via the biconditional elimination rule. If it is sunny, then John is driving a car can be inferred via the biconditional elimination rule.