The correct answer is D. Amazon Simple Storage Service (Amazon S3) is an online backup and storage system. It is a cloud-based storage service that offers a variety of features, including data redundancy, data encryption, and access control. Amazon S3 is a popular choice for businesses and individuals who need to store large amounts of data securely and reliably.
Amazon Elastic Compute Cloud (Amazon EC2) is a cloud-based computing platform that provides resizable compute capacity in the cloud. Amazon EC2 allows you to launch instances of your choice of operating system, including Linux and Windows, and provides you with complete control over your computing environment.
Amazon Simple Queue Service (Amazon SQS) is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. Amazon SQS provides reliable, many-to-many, asynchronous messaging between applications running on any platform.
Amazon Simple Notification Service (Amazon SNS) is a fully managed pub/sub messaging service that enables you to decouple microservices, distributed systems, and serverless applications. Amazon SNS provides reliable, many-to-many, asynchronous messaging between applications running on any platform.
In conclusion, Amazon S3 is the correct answer because it is an online backup and storage system. Amazon EC2, Amazon SQS, and Amazon SNS are all cloud-based services that provide different features.