A global enterprise needs its application to stay available if a single data center fails. Which cloud concept provides this?

Fault tolerance ensures an application remains operational even if a component or an entire data center fails. This is achieved through redundancy, distributing workloads across multiple independent resources like different availability zones or regions. If one data center experiences an outage, the application automatically fails over to resources in another, maintaining availability. Agility refers to the ability to rapidly develop, deploy, and scale applications, not specifically to resilience against failures. Vertical scaling involves increasing the resources of a single server, which doesn't protect against a data center-wide outage. Metered pricing is a billing model where you pay for what you use, unrelated to application availability during failures.