A database specialist manages a critical Amazon RDS for MySQL DB instance for a company. The data stored daily could vary from .01% to 10% of the current database size. The database specialist needs to ensure that the DB instance storage grows as needed.
What is the MOST operationally efficient and cost-effective solution?

A. Configure RDS Storage Auto Scaling.
B. Configure RDS instance Auto Scaling.
C. Modify the DB instance allocated storage to meet the forecasted requirements.
D. Monitor the Amazon CloudWatch FreeStorageSpace metric daily and add storage as required.