Four virtual machines host an application named App1. You deployed an Azure Standard Load Balancer named LB1 to distribute incoming HTTPS requests to App1. You want LB1 to stop sending traffic to unhealthy instances faster, while minimizing administrative effort. Which setting should you change?

The Health probes settings determine how the load balancer monitors the health of backend instances. To make LB1 stop sending traffic to unhealthy instances faster, you need to adjust the probe's frequency and unhealthy threshold. Decreasing the probe interval and the number of consecutive failures required to mark an instance as unhealthy will achieve this goal with minimal administrative effort. Changing the Backend pools settings would involve adding or removing VMs, not modifying health detection. Diagnostic settings are for logging and monitoring, not for influencing traffic distribution based on health. Load-balancing rules define how traffic is distributed among healthy instances, but they don't control how health is determined.