What is a "booster seat"?

1. AA standard seat intended for carrying children in a vehicle, in which the occupant is fastened by the vehicle's safety belt.
2. BA seat intended for carrying children on a bicycle only, in which the child seated is fastened by a safety belt.
3. CA seat intended for carrying children on a motorcycle only, in which the occupant is fastened by the vehicle's safety belt.
4. DA seat intended for a driver whose height is less than 160 cm and whose age is more than 18 years.

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