According to the AWS shared responsibility model, which task is the customer’s responsibility?
Maintaining the infrastructure needed to run AWS Lambda
Updating the operating system of Amazon DynamoDB instances
Maintaining Amazon S3 infrastructure
Updating the guest operating system on Amazon EC2 instances
Explanations:
AWS is responsible for maintaining the infrastructure that runs AWS Lambda, including the underlying servers, storage, and networking.
Amazon DynamoDB is a fully managed NoSQL database service, and AWS handles all updates, including the operating system and underlying infrastructure.
Amazon S3 is a managed service, and AWS is responsible for maintaining its infrastructure, including the servers and storage systems used for S3.
As a customer, you are responsible for managing and updating the guest operating system on Amazon EC2 instances, including applying security patches and updates.
I conclude that the answer is:
Updating the guest operating system on Amazon EC2 instances