Which system ensures the authenticity of users accessing health information?

The correct choice is authentication systems, as they are specifically designed to verify the identity of users who are trying to access health information. Authentication is a crucial aspect of information security, ensuring that only authorized individuals can gain access to sensitive data. This could involve various methods, such as passwords, biometrics, smart cards, or two-factor authentication, which bolsters the security of health information systems.

Other systems mentioned serve different purposes. Data storage systems focus on the management and organization of data, but they do not inherently secure or verify user identities. Backup systems are designed to create copies of data for recovery purposes in case of loss or corruption, rather than for validating user access. Data encryption systems protect data by converting it into a coded format, but they do not authenticate users; rather, they safeguard the data by ensuring that it can only be read by those who have the decryption key. Thus, authentication systems are the most relevant in ensuring that access to health information is controlled and monitored based on verified user identities.