Which statement about the validity of a student license is correct?

1. ①It is valid for 6 months from the date of issue.
2. ②It is valid for 1 year from the date of issue, and it ceases to be valid if a Class I or Class II driver's license for ordinary motor vehicles is obtained before then.
3. ③It is valid for 2 years from the date of issue.
4. ④It is valid for 1 year from the date of issue and remains valid for the rest of that period even if a driver's license for ordinary motor vehicles is obtained in the meantime.