Which of the following is a strong post designed to stop a car?

A gate controls entry and exit but does not provide the structural resistance needed to stop a moving vehicle under force.

A fence delineates a boundary and may deter pedestrian intrusion but lacks the mass and anchoring to stop a vehicle.

A bollard is a reinforced physical security barrier, typically made of steel or concrete, installed to stop or redirect vehicles. It is a standard perimeter security control used to protect buildings, pedestrian zones, and critical infrastructure from vehicle-borne attacks or accidental collisions. Unlike fences or gates, bollards are rated by their ability to stop vehicles of specific weights at specific speeds.

Reinforced rebar is a construction material used inside concrete structures, not a standalone post designed to stop vehicles.