What role do availability zones play in achieving a high level of resiliency for cloud-based solutions?

What role do availability zones play in achieving a high level of resiliency for cloud-based solutions?
A . They primarily serve to reduce operational costs by sharing resources across zones
B . They ensure that data is automatically compliant with all regional regulations
C . They offer isolated environments within a region to provide fault tolerance
D . They are used to limit the geographical scope of solutions to a single locale

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Answer: C