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A managed message queue or pub/sub service (AWS SQS/SNS, Azure Service Bus / Event Grid, GCP Pub/Sub) is primarily used to:
ADecouple producers and consumers in distributed systems, letting them process messages asynchronously and at different rates
BRun heavy GPU training workloads at scale
CReplace block storage attached to VMs
DEncrypt user passwords in a relational database
Answer & Solution
Correct answer: A. Decouple producers and consumers in distributed systems, letting them process messages asynchronously and at different rates
Queues and pub/sub topics buffer messages so producers don't block on consumers; consumers process at their own pace. They aren't storage, compute, or crypto services.
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