You have a Cloud SQL for MySQL Enterprise instance with four read replicas. Your next scheduled maintenance event is scheduled tomorrow at 6 PM. Your security team identifies an important security vulnerability. You are notified by your management at 8 PM today to update your primary instance and all four read replicas during approved business downtime today at 11 PM. What should you do?

A. Reschedule the upcoming scheduled maintenance to happen today at 11 PM. B. Perform self-service maintenance on the selected read replicas. C. Perform self-service maintenance on the primary instance during scheduled business downtime. D. Reschedule the upcoming scheduled maintenance of the primary instance to apply updates immediately.