Which AWS service provides fully managed machine learning capabilities with AutoML features?

Correct answer: Amazon SageMaker

Option C is correct because Amazon SageMaker is AWS's fully managed machine learning platform that provides end-to-end ML capabilities including SageMaker Autopilot, its AutoML feature that automatically explores algorithms and hyperparameters to build, train, and tune models with minimal manual effort. Option A is incorrect because Amazon EC2 provides general-purpose virtual compute instances and has no built-in ML or AutoML capabilities; it would require the user to manually install and configure all ML frameworks. Option B is incorrect because Amazon RDS is a managed relational database service used for structured data storage and querying, and it provides no machine learning training or AutoML functionality. Option D is incorrect because AWS Lambda is a serverless function execution service for short event-driven code and does not offer ML model training, AutoML, or managed ML pipelines.