Which metric best indicates that a Container App's HTTP scale rule threshold is set too high?

1. ✓ A Replica count stays at minReplicas while request latency climbs (correct answer)
2. B CPU usage is low
3. C Memory usage is stable
4. D Revision count increases

Shortcut: If concurrency per replica must exceed a high threshold before scaling triggers, queuing builds up and latency rises while the replica count remains flat. Lower the concurrentRequests target.