What should personnel do if they are away from their desk or police vehicle?

The correct choice highlights the importance of security and protecting sensitive information. When personnel are away from their desk or police vehicle, rendering their computer inaccessible is a critical action to prevent unauthorized access and ensure that sensitive data remains protected. This can involve logging off the computer or locking the screen, which helps to maintain confidentiality and protect against potential breaches of information.

In the context of law enforcement and related work, ensuring that equipment and data are secure when personnel are not present is a fundamental practice. This approach keeps both personal and organizational information safe from unauthorized users, further emphasizing the responsibility that comes with handling sensitive information in such roles.

The other options reflect considerations for security and communication but do not directly address the critical step of making the computer inaccessible while personnel are away. For instance, while locking doors is important for physical security, it does not specifically pertain to the computer or sensitive data. Similarly, ensuring accessibility may not align with the need to protect information when personnel are absent. Notifying a supervisor could be part of proper protocol, but it does not address the immediate action needed concerning the security of computers and data.