Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to check tire tread [title] Place a penny into any tread groove on your tire. [title] Rotate the penny so abraham lincoln's head is upside down and inside the tread. [title] Determine whether you can see lincoln's entire head when the penny is inserted into the tread groove.

Ending1: [title] Determine whether you can see lincoln's whole face. [substeps] If lincoln's mouth is coming out into a down position, you must feel that person's head should be tilted away from you. Ending2: [step] Your tires are considered safe and legal if a portion of lincoln's head is covered by the tread. However, if you can see lincoln's entire head after inserting the penny into the groove, you may need to replace your tire. Ending3: [title] Find the marks about 45 degrees away from the headlight head and 50 degrees down on the tire surface. [step] Make note of any new tire tread markings on the driver's side of the tire. Ending4: [substeps] To measure tread and see whether lincoln's head is upside down, you need to see abraham lincoln's head through the tread groove, crossing most of his torso. [title] Align the pennies so abraham lincoln's head is resting facing to one side.

Answer format: ending1/ending2/ending3/ending4