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TerramEarth manufactures heavy equipment for the mining and agricultural industries, and they have a legacy web application that cannot be migrated to the cloud. The application is critical for their operations, and they need a cloud-native way to monitor it. In case the application goes down, the URL should quickly point to a 'Site is unavailable' page, and the Ops team should be notified immediately. Considering the need for reliability and cost-effectiveness, what solution should TerramEarth implement?
A
Create a scheduled job in Cloud Run to invoke a container every minute. The container will check the application URL. If the application is down, switch the URL to the 'Site is unavailable' page, and notify the Ops team.
B
Create a cron job on a Compute Engine VM that runs every minute. The cron job invokes a Python program to check the application URL. If the application is down, switch the URL to the 'Site is unavailable' page, and notify the Ops team.
C
Create a Cloud Monitoring uptime check to validate the application URL. If it fails, put a message in a Pub/Sub queue that triggers a Cloud Function to switch the URL to the 'Site is unavailable' page, and notify the Ops team.
D
Use Cloud Error Reporting to check the application URL. If the application is down, switch the URL to the 'Site is unavailable' page, and notify the Ops team.