Please choose the correct ending to complete the given sentence: Work World: [header] How to become a train driver [title] Meet the general qualifications. [substeps] You must be at least 18 years of age. You must pass a background check and a drug screen.

Ending1: You must have a high school diploma or ged. You should also have a bachelor's degree. Ending2: You must be able to work alone for long periods of time, handle emergency situations and think for yourself. [title] Attend formal training, which will consist of classroom study and hands-on experience. Ending3: You must not have had an accident on a train. You must have never been convicted of a felony. Ending4: You must have been in a rehabilitation facility or equivalent for a minimum of 120 hours. You must have completed no criminal offense within 120 days.

Answer format: ending1/ending2/ending3/ending4