What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If David were a police officer, then Jennifer is driving a car. If it is windy, then Jennifer is driving a car. If Jennifer drives a car, then David is a police officer. David is a police officer or it is windy.
If it is windy, then David is a police officer. Jennifer is driving a car. David is a police officer if and only if Jennifer is driving a car. Jennifer is driving a car if and only if David is a police officer.