A driver says the Colorado S endorsement only tests stop-arm operation. Which response best matches 49 CFR 383.123?

1. Correct, stop-arm operation is the only required topic
2. Incorrect, the federal knowledge areas also include loading and unloading children, mirrors, flashing lights, emergency exits and evacuation, railroad crossings, and operating practices
3. Correct, because passenger qualification covers all other topics
4. Incorrect, because S endorsement testing is only about hazardous materials