Fault tolerance in the AWS Cloud is most closely associated with which concept?

Answer choices

1. a. Designing for component failure without service interruption
2. b. Using one large instance, without preserving cloud audit logs or hunting mailbox rules and delegate permissions, without security or identity team coordination per policy.
3. c. Rely on Designing for component failure without service interruption alone while omitting the cross-service integration the workload needs
4. d. Designing across multiple Availability Zones, while leaving refresh tokens and OAuth consent grants active pending user callback, without security or identity team coordination per policy.