Which one of the following is showing the correct sequential order of vertebrae in the vertebral column of human beings?

1. Cervical — lumbar — thoracic — sacral — coccygeal

2. Cervical — thoracic — sacral — lumbar — coccygeal

3. Cervical — sacral — thoracic — lumbar — coccygeal

4. Cervical — thoracic — lumbar — sacral — coccygeal