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Dress4Win, a web-based company helping users manage their personal wardrobe through a website and mobile application, has grown rapidly. They are migrating to Google Cloud and have configured a new uptime check with Google Stackdriver for several of their legacy services. However, the Stackdriver dashboard is not reporting the services as healthy. What should they do?
A
Install the Stackdriver agent on all of the legacy web servers.
B
In the Cloud Platform Console download the list of the uptime servers' IP addresses and create an inbound firewall rule.
C
Configure their load balancer to pass through the User-Agent HTTP header when the value matches GoogleStackdriverMonitoring-UptimeChecks (https://cloud.google.com/monitoring).
D
Configure their legacy web servers to allow requests that contain user-Agent HTTP header when the value matches GoogleStackdriverMonitoring-UptimeChecks (https://cloud.google.com/monitoring).