I don't think the correct answer is A) Cloud Functions are not about monitoring at all, but I have found one mention of using cloud functions for monitoring: https://cloud.google.com/solutions/serverless-web-performance-monitoring-using-cloud-functions . But the mentioned article is about WEB page performance and it does require a lot of efforts. The question does not have info about the kind of service to monitor, so I think the answer should be D) - "Use Stackdriver Monitoring to monitor resources and raise alerts"
D. Use Stackdriver Monitoring to monitor resources and raise alerts.
Stackdriver Monitoring provides out-of-the-box and custom monitoring capabilities for Google Cloud resources and applications. It allows you to create alerting policies that notify you when certain system metrics violate user-defined thresholds. This is a quick and effective way to set up alerts for resource monitoring and service degradation without the need for extensive development time.
D
Error Reporting is not about service degradation, more, Error Reporting uses Monitoring to send alerts.
https://cloud.google.com/error-reporting/docs/notifications
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