What is the most precise description of a false rib?
1) A rib that has no cartilaginous connection to the sternum
2) A rib that connects indirectly to the sternum by a costal cartilage, or has no connection to the sternum
3) A rib that never ossifies, but remains as cartilage throughout life
4) A rib that connects directly to the sternum by its own costal cartilage
5) A rib that does not articulate with the vertebral column