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Which Azure storage feature lets you fire an Azure Function when a new blob is uploaded?
AA Blob Storage Event (via Event Grid) triggering the function
BA Bastion-based file watcher
CManually polling the bucket every minute from a VM
DA Cosmos DB change feed against a different container
Answer & Solution
Correct answer: A. A Blob Storage Event (via Event Grid) triggering the function
Event Grid emits BlobCreated events that trigger Functions, Logic Apps, or webhooks. Polling wastes compute; Cosmos change feed watches Cosmos, not Blob; Bastion isn't a watcher.
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