Which scaling rule prevents a Container App from scaling below 1 replica, ensuring it remains warm?

1. A Set scaleRules to empty
2. ✓ B Set minReplicas to 1 (correct answer)
3. C Set maxReplicas to 1
4. D Set HTTP rule concurrent requests to infinity

Shortcut: Setting minReplicas: 1 ensures at least one replica is always running, preventing cold starts. This costs more than scale-to-zero but avoids startup latency for latency-sensitive apps.