Discussion
Assertion (A): A highly available deployment places subnets in at least two availability zones.
Reason (R): A subnet lives in one zone, so a single subnet deployment fails with that zone.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the constraint that forces the practice. A subnet is bound to a single availability zone, so everything in it shares that zone’s fate. Spreading subnets across two or more zones, with the load balancer and the database replica following, is what allows the deployment to survive the loss of one - and it is why zone count, not instance count, sets the resilience.
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