What preventive maintenance can you carry out on the battery?

You selected answers 1 and 2, which are both correct. For battery maintenance, you should regularly check that the cable connections and battery support are firmly in place, as loose connections can lead to problems with starting and electrical systems. You should also clean and grease the battery poles to prevent corrosion, which helps maintain good electrical contact. Exchanging battery acid (answer 3) is not part of regular maintenance and can be dangerous; this should only be done by professionals. Remember, regular cleaning and secure connections help extend battery life and prevent common electrical issues in your car.