Which of the following is an example of an availability function rather than a PKI-supported feature?

The correct choice exemplifies an availability function because it focuses on maintaining operational functionality and ensuring services remain accessible, especially in the face of disruptions or failures. Hardware monitoring plays a crucial role in identifying potential failures within systems, while disaster recovery encompasses strategies and processes that enable the restoration of services and data after a catastrophic event, thus ensuring that resources remain available to authorized users when needed.

The other options represent features primarily associated with different aspects of cybersecurity. Integrity checks are designed to ensure data has not been altered or corrupted, which primarily pertains to data integrity rather than availability. Key distribution is a fundamental aspect of public key infrastructure (PKI), focusing on the management of cryptographic keys rather than service availability. Non-repudiation refers to the assurance that someone cannot deny the validity of their signature on a document or a message, which is closely related to authenticity and accountability rather than the continued operation of services or systems. Therefore, the choice that emphasizes hardware monitoring and disaster recovery is the one aligned with availability functions in the context of cybersecurity architecture.