Which of the following is NOT a security feature of RDS?

The correct choice highlights that automatic data archiving is not a security feature of Amazon RDS (Relational Database Service). While RDS provides various features to ensure the security and integrity of databases, such as encryption at rest and in transit, IAM (Identity and Access Management) database authentication, and network security groups, automatic data archiving is primarily a data management feature rather than a security feature.

Encryption at rest and in transit ensures that data is protected when stored on disk and while being transmitted over the network, addressing potential vulnerabilities in data confidentiality. IAM database authentication enhances security by allowing users to authenticate using AWS IAM credentials instead of traditional database credentials, easing management and potentially improving security. Network security groups further bolster security by controlling inbound and outbound traffic to instances running RDS, allowing you to specify which IP addresses or CIDR ranges can communicate with the database.

On the other hand, automatic data archiving focuses on data retention and management rather than protective measures against unauthorized access or data breaches. While effective for reducing storage costs and improving performance, it lacks the direct security implications associated with the other features listed. That's why the identification of automatic data archiving as not being a security feature is accurate.