Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to buy an optional memory module for your car's navigation system [title] Determine the need for more memory for the car navigation system. [substeps] Consult the owner's manual for the car navigation system. Find the listed free memory space of the car navigation system.

Ending1: Locate the " limited use memory " section. Find the small pedal parts and bearing assembly section. Ending2: Note that the owner's manual of the car navigation system may list total memory space. The total memory space is not important to determine because the operating system of the car navigation system will occupy much of that space. Ending3: Consider using the manufacturer's existing memory module to decide the exact amount of memory you will need. Finally, figure out your radio frequency and sound quality in order to determine the recommended memory width for the car navigation system. Ending4: Look in the driver's side panel for various features such as steering, parking and mirror. [title] Consider the advantages of using the memory module.

Answer format: ending1/ending2/ending3/ending4