Access controls are essential in information security for ensuring that resources are available to authorized users and protected from unauthorized access. The methods of access control can be categorized as follows:

Detective: These controls are designed to identify and record unauthorized access attempts. They do not prevent access but are useful for auditing and monitoring purposes.

Physical: Physical controls are tangible measures taken to protect assets, such as locks, fences, and security guards.

Preventive: Preventive controls are designed to stop unauthorized access before it happens. This includes mechanisms like passwords, biometric scans, and encryption.

The combination of detective, physical, and preventive controls provides a robust framework for managing access to sensitive information and systems. Reactive controls are not typically classified as access controls since they deal with responding to incidents after they occur, and virtual controls are not a recognized category in this context.

References: The answer is based on the principles outlined in the BCS Information Security Management Principles, which include various access control methods to protect information integrity, confidentiality, and availability123.