Countermeasures address security concerns in which of the following categories?

Countermeasures are essential components of a robust security framework and are designed to address a variety of security concerns across multiple categories. Choosing "All of the listed categories" reflects the comprehensive nature of security practices.

Physical countermeasures involve protective measures for physical assets, such as security guards, surveillance systems, and access controls that help safeguard buildings, hardware, and infrastructure from unauthorized access or damage.

Operational countermeasures focus on the procedures and processes that govern how security is managed and maintained within an organization, including policies for employee behavior, incident response plans, and regular security training.

Communication countermeasures address the security of data in transit, involving encryption, secure protocols, and secure communication channels to protect sensitive information from eavesdropping or interception.

Since all these categories—physical, operations, and communication—are critical in establishing an effective security posture, it is clear why the correct answer encompasses all of them, highlighting the need for a multi-faceted approach to security risk management.