What are considered the pillars of cyber security?

The correct answer highlights a comprehensive understanding of the fundamental principles that underpin cyber security. The pillars identified—Confidentiality, Integrity, Availability, Non-repudiation, and Authentication—form a robust framework necessary to protect information systems.

Confidentiality ensures that sensitive information is not accessed by unauthorized individuals, maintaining privacy and restricting access to data only to those who have the rights to view it. Integrity involves maintaining the accuracy and completeness of data, confirming that it remains unaltered during processing or transmission. Availability guarantees that information and resources are accessible to authorized users when needed.

Non-repudiation is critical as it prevents parties from denying the authenticity of their signatures or the sending of messages, thereby establishing accountability in digital transactions. Lastly, Authentication is the process of verifying the identity of users or systems, ensuring that only rightful parties can access certain resources.

This set of principles is essential in creating a secure environment and addressing potential threats in cyber space, thus making it the most appropriate answer for the question posed. Other options either miss key components or include practices that, while beneficial, do not embody the foundational pillars of cyber security.