A company stores objects in an Amazon S3 bucket. Which of the following is the responsibility of AWS?

Protecting the underlying infrastructure that supports S3 storage is an AWS responsibility under the shared responsibility model. AWS is responsible for the security of the cloud, which includes the physical facilities, network infrastructure, and hardware that run S3. The other options—configuring an S3 Lifecycle policy, enabling S3 Versioning, and setting S3 bucket policies—are all customer responsibilities. These actions fall under security in the cloud, meaning the customer is responsible for managing their data, access controls, and configuration within the S3 service.