Your company is closely monitoring their cloud spend.

The correct answer is A because Google Cloud Billing budgets and alerts handle threshold-based notifications without custom engineering, while Cloud Billing export to BigQuery provides detailed billing data for dashboards and deeper cost analysis. This directly meets both requirements: notifications when spend reaches thresholds and dashboard creation for detailed insights. Writing scripts to call the Cloud Billing API adds unnecessary engineering and maintenance because billing export already provides a managed data pipeline into BigQuery. Deploying Grafana on Compute Engine introduces server management and extra operational cost. Asking teams to create their own alerting stack is less controlled and less aligned with Google-recommended managed services. Budget alerts plus BigQuery export is simpler, scalable, and cost-effective.