Which of the following measures can help improve workplace security?

Implementing multiple security measures is essential for enhancing workplace security, and the choice that includes all of these measures reflects a comprehensive approach.

Requiring visitors to obtain a pass is crucial as it helps monitor who is entering and exiting the premises. This not only ensures that unauthorized individuals cannot access sensitive areas but also provides a log of visitors for security audits.

Having key-card access systems enhances security by restricting entry to authorized personnel only. This technology allows for easy tracking of who enters and exits various areas within the workplace, and can be configured to limit access to specific times or areas based on an individual's role.

Requiring workers to wear identification badges serves as a visible indication of authorized personnel. This measure fosters a culture of security and can help quickly identify anyone who should not be in the workplace. It also allows employees to recognize each other and feel more secure.

Together, these measures create a layered security approach, making it significantly harder for unauthorized individuals to access the workplace and ensuring that all personnel are accountable. Therefore, the most comprehensive answer is one that encompasses all these security practices.