Which responsibility belongs to AWS when a company hosts its databases on Amazon EC2 instances?

Explanations:

AWS does not manage database backups. The company is responsible for setting up and managing backups.

The company is responsible for managing database software patches. AWS provides the infrastructure but not the database software management.

AWS is responsible for the underlying infrastructure, but the company must manage operating system patches on EC2 instances.

AWS is responsible for the operating system installations on EC2 instances, as it manages the underlying infrastructure.