Your retail organization is preparing for the holiday season. Use of catalog services is increasing, and your DevOps team is supporting the Cloud SQL databases that power a microservices-based application. The DevOps team has added instrumentation through Sqlcommenter. You need to identify the root cause of why certain microservice calls are failing. What should you do?

A. Watch Query Insights for long running queries. B. Watch the Cloud SQL instance monitor for CPU utilization metrics. C. Watch the Cloud SQL recommenders for overprovisioned instances. D. Watch Cloud Trace for application requests that are failing.