The Prius was introduced in 2001 as a sedan. It has lower anchors for 2D & 2P, tethers for all 3 seating positions, and head restraints for 2D & 2P. Because 2C has no head restraint, it is not a safe place for kids in backless boosters or adults as there is no protection against whiplash. The Prius was only offered as a sedan for 2001-2003. Starting in 2004 the Prius was only offered as a hatchback.