Which statement about carrying and presenting a driver's license is correct?

1. ①A mobile driver's license is not recognized as the license to be carried while driving, so the physical card must also be carried.
2. ②A construction machinery operator license is never included among the licenses to be carried while driving.
3. ③If a police officer asks to see the license for traffic safety, or asks questions to confirm identity and license, the driver must comply.
4. ④If the driver left the license at home, the driver need not answer a police officer's identity questions.