An organization using a cloud provider for its online billing system requires the website to be accessible to customers at all times. What is the BEST way to verify the organization's business require

Invoking a "right-to-audit" clause is a reactive and typically disruptive measure used when significant issues or non-compliance are suspected, rather than a routine method for continuous verification of service accessibility.

While requiring outage reports provides information, it is a reactive measure and doesn't proactively verify ongoing accessibility against a defined standard or allow for consistent monitoring of overall service health.

Monitoring the Service Level Agreement (SLA) with the vendor is the best way to verify business requirements are met, as the SLA legally binds the cloud provider to specific uptime, performance, and availability metrics, and typically includes reporting mechanisms for breaches and remedies. This allows for objective measurement against contractual obligations.

Periodic performance discussions are valuable for communication and relationship management, but they do not provide continuous, objective, and contractual verification of meeting accessibility requirements like an SLA does.