Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to install a car stereo [title] Set the parking brake and disconnect the negative cable from your car battery. [step] Be sure to do this to avoid short-circuiting the electrical system during the installation. [substeps] For instructions on disconnecting the battery, see how to disconnect a car battery.

Ending1: [title] Disconnect the battery if using a manual transmission transmission. [step] Not all modern vehicles have the capability to remove a battery if using the manual transmission. Ending2: [title] Locate a flat, grass surface, like a driveway. [step] It's better to have smooth, level ground instead of moist pavement. Ending3: [title] Unscrew any screws that are securing the trim in place. [step] Be careful to remove all screws before trying to pry off the trim or you may break it. Ending4: Before you begin, refer to the vehicle owner's manual. Some vehicles have built-in parking brakes attached to other vehicles.

Answer format: ending1/ending2/ending3/ending4