What should a solutions architect do to meet these requirements?

Explanations:

Reducing the Lambda concurrency rate might reduce the load on the database, but it does not address the root cause of database connection timeouts and could impact application performance.

Enabling RDS Proxy helps manage database connections efficiently by pooling and reusing connections, which can reduce the likelihood of timeouts during peak traffic.

Resizing the RDS DB instance may increase capacity, but it doesn’t address the issue of managing and reusing database connections, which is the root cause of timeouts.

Migrating to Amazon DynamoDB would require significant code changes and is not necessary for solving connection timeout issues, as RDS Proxy can handle connection management for relational databases.