Which action would least contribute to improving the security of a computer facility?

Removing water sprinkler systems in favor of carbon dioxide systems would least contribute to improving the security of a computer facility because it compromises fire safety measures. While carbon dioxide systems can be effective for certain types of fires, especially in environments like data centers where water can damage equipment, eliminating water sprinklers removes a crucial layer of fire protection that is generally more effective for a variety of fire types. Fire prevention and control are essential components of facility security, as they protect against physical threats to the integrity of the data and systems housed within the facility.

In contrast, providing 24-hour security surveillance, strengthening access controls, and making the facility inconspicuous all contribute to enhancing the overall security posture. Continuous surveillance helps deter unauthorized access and monitor for potential security breaches, while stronger access controls limit entry to authorized personnel, reducing the risk of inside threats. Making the facility inconspicuous can decrease the likelihood of it being targeted for theft or vandalism. Therefore, while fire safety is critical, the choice to remove sprinklers for carbon dioxide systems undermines the imperative of protecting the facility from fire-related risks, making it a less effective action in the context of overall security improvements.