Which AWS service will integrate directly with the event notification?

Explanations:

AWS Lambda is a serverless compute service that can be triggered directly by Amazon S3 event notifications. It allows code to run automatically in response to events like object uploads.

Amazon EC2 is a compute service that provides virtual servers. It does not integrate directly with S3 event notifications; code running on EC2 would require additional setup to listen for events.

Amazon Elastic Container Registry (ECR) is a service for storing and managing Docker container images. It does not handle event notifications from S3 directly.

AWS Elastic Beanstalk is a platform as a service (PaaS) for deploying applications. While it can host applications that respond to S3 events, it does not directly integrate with S3 notifications.