What preventive measures can be taken to avoid unauthorized building access?

The selected response is correct because checking all entries regularly and ensuring proper credential enforcement is a comprehensive preventive measure that directly addresses the issue of unauthorized access to buildings. This involves actively monitoring access points to ensure that only individuals with the proper permissions can enter. Implementing strict credential checks, such as requiring identification badges or passcodes, helps to maintain security and can significantly reduce the risk of unauthorized personnel gaining access.

Regular checks of all entry points help identify potential vulnerabilities and ensure that security protocols are followed consistently. This proactive approach not only deters unauthorized access but also allows for prompt identification and response to any security breaches, contributing to the overall safety of the building.

Other options fall short in enhancing security significantly. Relying exclusively on video surveillance fails to prevent unauthorized access; it serves more as a reactive measure rather than a proactive deterrent. Locking all doors after business hours is a good practice but does not address the entire scope of access during operational hours. Installing a new heating system does not relate to security measures at all and would not contribute to preventing unauthorized access.