A company runs a three-tier web application on Amazon EC2 instances within a single Availability Zone. The application stores data in a self-managed MySQL database running on an EC2 instance. The database uses a 1 TB Provisioned IOPS SSD (io2) Amazon EBS volume. At peak usage, the company expects 1,000 IOPS for both read and write operations. The company wants to transition to a fully managed database service that is fault tolerant and highly available. They aim to reduce costs, minimize performance disruptions, and retain the ability to support up to 2,000 IOPS. What is the most cost-effective solution that satisfies these requirements?