Which solution will resolve these errors?

Explanations:

Increasing the read and write capacity units (RCUs and WCUs) does not address the issue of too many open connections. These parameters affect read and write throughput, not the number of concurrent connections allowed to the database.

Configuring RDS Proxy helps manage database connections by pooling and sharing connections. This reduces the number of idle connections to the Aurora DB cluster, preventing the “too many connections” error during peak usage times. Updating the application to use the RDS Proxy endpoint enables the application to leverage this connection pooling.

Turning on enhanced networking primarily improves network performance for EC2 instances but does not specifically address the issue of connection limits or manage the number of concurrent database connections. It is not a solution for the “too many connections” error.

Modifying the DB cluster to use a burstable instance type may improve performance during spikes in usage, but it does not directly solve the issue of too many open connections. Burstable instances are meant for workloads with variable CPU usage, but they do not affect the maximum number of concurrent connections allowed to the database.