A company needs the highest Pub/Sub resilience to regional outages and is willing to pay more to keep latency as low as possible during failures. Which design does Google recommend?

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B. Publish and subscribe simultaneously in multiple regions and make processing idempotent. Google's highest-resiliency design is to publish and subscribe simultaneously in multiple regions with idempotent processing, because every message is delivered multiple times across regions. Pub/Sub does not automatically fail over publishers or subscribers across regional service outages in the way the third option suggests.

A company needs the highest Pub/Sub resilience to regional outages and is willing to pay more to keep latency as low as possible during failures. Which design does Google recommend?

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