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Answer: Deliver at least once
Cloud Pub/Sub guarantees to deliver messages at least once. This means it's possible for a message to be delivered more than once. For more details, visit [Cloud Pub/Sub documentation](https://cloud.google.com/pubsub/docs/subscriber).
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A consultant suggests replacing your current messaging system with Cloud Pub/Sub. However, you're worried about the differences in delivery guarantees between the two systems. What delivery semantics does Cloud Pub/Sub ensure?
A
Best effort but no guarantee
B
Deliver at least once
C
Deliver at most once
D
Deliver at most or deliver at least depending on configuration of the subscription