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An app needs to fire an event when a blob is uploaded to ANY of 5 storage accounts and route it to multiple subscribers. Which Azure service best fits?
AAzure Service Bus only
BManually polling each storage account every minute
CAzure DNS
DAzure Event Grid — publishes BlobCreated events from each account to subscribed handlers (Functions, Logic Apps, webhooks)
Answer & Solution
Correct answer: D. Azure Event Grid — publishes BlobCreated events from each account to subscribed handlers (Functions, Logic Apps, webhooks)
Event Grid is the canonical reactive event-routing layer for Azure resource events. Service Bus is for message queues. Polling is wasteful. DNS isn't messaging.
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