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Which Functions runtime binding lets a function automatically execute when a new message lands on a Service Bus queue?

AThe Service Bus trigger (input binding) on the function
BAn HTTP trigger that calls Service Bus internally
CA 1-minute timer trigger polling the queue manually
DA SignalR output binding
Answer & Solution
Correct answer: A. The Service Bus trigger (input binding) on the function
Service Bus triggers wire the function to the queue/topic — Azure handles polling + delivery + dead-lettering. Timer polling is wasteful; HTTP-trigger polling is even worse; SignalR isn't a queue.
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