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

A gate controls entry and exit but is not inherently designed to withstand vehicle impact force.

A fence is a perimeter boundary control that deters casual intrusion but cannot reliably stop a moving vehicle.

A bollard is a short, sturdy vertical post installed in the ground, often made of steel or reinforced concrete, specifically designed to prevent vehicle intrusion or ram-raid attacks. Unlike other perimeter controls, bollards are rated by their ability to stop vehicles at specific speeds and weights. They are a standard physical security measure used to protect building entrances, server facilities, and other sensitive areas.

Reinforced rebar is a construction reinforcement material used inside concrete structures, not a standalone security barrier product.