A company has a suite of web applications that is heavily using RDS database in Multi-AZ Deployments configuration with several Read Replicas. For improved security, you were instructed to ensure that all of their database credentials, API keys, and other secrets are encrypted and rotated on a regular basis. You should also configure your applications to use the latest version of the encrypted credentials when connecting to the RDS database. Which of the following is the MOST appropriate solution to secure the credentials?