You can use the AWS Management Console to view key operational metrics for your DB Instance deployments, including ____?

Explanations:

While I/O activity and DB Instance connections are part of the CloudWatch metrics, “number of users” is not a standard CloudWatch metric for RDS.

DB Engine Version Management is not a metric provided by CloudWatch; it’s a feature related to database management, not operational monitoring.

Username is not a CloudWatch metric. CloudWatch focuses on operational metrics like I/O activity and DB Instance connections.

This option includes the correct CloudWatch metrics for Amazon RDS: compute, memory, and storage capacity utilization, I/O activity, and DB Instance connections.