A company is in the process of evaluating cloud service providers, as it is planning to move all of its on- premises IT services to the cloud. Most of the applications are mission critical with four 9

While local and regional failure zones are critical, including 'international' failure zones might be excessive or introduce data residency complexities for a government customer, where 'national' often suffices for geographic separation within a country.

This option also includes 'international' failure zones, which may not be the best fit for a government client's data sovereignty requirements when 'national' offers sufficient geographic isolation.

Selecting a cloud service provider with local failure zones (e.g., Availability Zones) ensures resilience against single datacenter failures, while leveraging regional and national failure zones (multiple geographically distinct regions) provides comprehensive protection against widespread natural disasters and regional outages, fulfilling the stringent uptime and disaster recovery requirements for mission-critical applications and government entities.

This option omits protection against 'local' failure zones, which are essential for surviving single datacenter outages, typically addressed by deploying across Availability Zones within a single cloud region.