Which of the following is used to prevent automobiles from crashing into a building?

Cameras are used for surveillance and recording, not for physically preventing collisions.

A bollard is a short, sturdy post typically made of concrete or metal, installed to physically block or guide traffic and protect buildings, pedestrians, or infrastructure from vehicle impacts. Bollards are a common physical security measure designed to withstand collisions.

Lighting enhances visibility and can deter some security threats, but it does not physically stop vehicles.

Biometrics are authentication methods based on unique biological traits, completely unrelated to preventing physical crashes.