Which approach scales a Container App consumer based on Service Bus backlog?

1. A A CPU scale rule
2. ✓ B A KEDA azure-servicebus scaler using queue length with messageCount threshold (correct answer)
3. C A cron rule
4. D Manual scaling

Shortcut: The KEDA Service Bus scaler reads the queue or subscription message count and scales replicas, including from zero, according to the configured messageCount target.