Which discipline focuses on protecting data in computer systems against unauthorized access?

The correct choice centers on COMPUSEC, which stands for Computer Security. This discipline is specifically dedicated to safeguarding the integrity, availability, and confidentiality of data stored on computer systems. COMPUSEC encompasses various practices and measures designed to prevent unauthorized access to both physical hardware and the data it contains. This includes the implementation of access controls, encryption, user authentication, and various security policies that aim to protect sensitive information from threats.

Understanding the protection of data in computer systems is fundamental in the realm of cybersecurity. The principles of COMPUSEC apply to all aspects of computing, from securing networked environments to protecting individual workstations. This makes it an essential area of focus for anyone involved in maintaining the security and integrity of information processed through technological systems.