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A company uses an Amazon RDS for MySQL instance for its operational database. To handle the increased read-only traffic during a recent peak period, the company added a read replica. During the peak period, the CPU usage on the read replica reached 60%, and the primary instance also had 60% CPU usage. After the peak period ended, the read replica's CPU usage decreased to 25%, while the primary instance consistently remains at 60%. The company wants to optimize costs while ensuring enough capacity for future growth. Which solution will meet these requirements?