In which service can you define data-driven workflows for tasks?

The correct choice for defining data-driven workflows for tasks is AWS Data Pipeline. This service is specifically designed for processing and moving data between different AWS compute and storage services. With AWS Data Pipeline, users can create complex workflows that describe how data is ingested, transformed, and stored. It allows for scheduling, running, and monitoring data workflows, making it easier for users to automate data processing tasks efficiently.

AWS Data Pipeline is built to handle tasks such as data validation, data transformation, and the execution of analytics jobs across multiple services. Users can define their workflows using a JSON-based configuration, which provides the flexibility to set up data dependencies and triggers based on predefined criteria. This makes it particularly strong in scenarios where managing data flow across various environments or services is necessary.

The other options serve different purposes and do not focus on orchestrating data workflows in the same way as AWS Data Pipeline. AWS Lambda is used primarily for serverless compute tasks that execute code in response to events. Amazon CloudWatch is a monitoring service used for observing resource and application metrics, while Amazon DynamoDB is a NoSQL database service designed for fast and consistent performance at scale, rather than for workflow management.