The correct answer is D, AWS Managed Services (AMS). AMS is designed to extend a company's team with operational capabilities, including monitoring, incident management, AWS Incident Detection and Response, security, patch management, backup, and cost optimization. This service is particularly beneficial for companies that lack the staff to maintain and protect their critical business applications in the AWS Cloud. While AWS Shield provides DDoS protection, Amazon RDS is a relational database service, and AWS Config is a service that helps assess, audit, and evaluate the configurations of AWS resources, none of these services offer the comprehensive management capabilities that AMS provides.