The availability of a system has been labeled as the highest priority. Which of the following should be focused on the MOST to ensure the objective?

Authentication focuses on verifying user identities and controlling access to systems, which is a security concern, not a direct factor in ensuring the physical availability or uptime of the system itself.

HVAC (Heating, Ventilation, and Air Conditioning) systems are critical for maintaining the proper temperature and humidity levels within server rooms and data centers. Without adequate cooling and environmental control, server hardware can overheat, leading to performance degradation, component failure, and system downtime, thus directly impacting availability.

Full-disk encryption protects data confidentiality by making it unreadable without the correct key, which is a security feature and does not directly contribute to system availability.

File integrity checking verifies that files have not been tampered with or corrupted, addressing data integrity and security, rather than the physical availability of the system.