What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y will drive a car if and only if y is curious. For all y, y will drive a car if and only if y is happy.
For all y, if y drives a car, then y is curious. For all y, if y drives a car, then y is happy. For all y, if y were curious, then y is driving a car. For all y, if y were happy, then y is driving a car.