Alaina is concerned about vehicles that might impact her organization's backup generator. What should she install to prevent both inadvertent and purposeful vehicle impacts on a generator installed outside her building near a parking lot?

Bollards are used to protect infrastructure and structures, and they are usually concrete or steel posts, planters, or similar structures that are intended to prevent a vehicle from impacting what they protect. Speed bumps won't prevent an impact, although they might slow it. Access control vestibules are used to ensure only authorized personnel access a space, and chain-link fences are not typically sufficient for this type of control.