Under Article 55 of the Implementation Regulations, what is the age restriction for carrying minor passengers on the rear seat of an ordinary two-wheeled motorcycle?

1. Children under the age of 12 are strictly prohibited from riding on the rear seat (摩托车后座不得乘坐未满12周岁的未成年人)
2. Children of any age may ride if held securely by the driver
3. Children under the age of 6 are permitted with a child seat
4. Children aged 8 and older may ride if wearing high-visibility vests