Enabling Data Access logs will lead to increased log ingestion and may exceed logs allotment limits. Additionally, adjusting the default logs retention in Cloud Logging from 30 to 90 days will result in storage costs. Options B and D are not concerns as they are automatically managed by GCP. Option F is irrelevant as there are no cost implications associated with logs routing. For more details, refer to Google Cloud's Stackdriver pricing documentation on ingestion, storage, and reducing logs use.