Which of the following is a Web service that can publish messages from an application and deliver them to other applications or to subscribers?

amazon elastic compute cloud
amazon simple queue service
amazon simple notification service
amazon simple storage system

The correct answer is: C. Amazon Simple Notification Service (SNS)

Amazon Simple Notification Service (SNS) is a fully managed pub/sub messaging service that enables you to decouple microservices, distributed systems, and serverless applications.

SNS provides topics, which are logical groupings of messages. You can publish messages to a topic, and any number of subscribers can receive those messages.

Subscribers can be other AWS services, such as AWS Lambda, or they can be applications that you write.

SNS is a highly scalable and durable service that can be used to send millions of messages per second.

Here are some of the benefits of using SNS:

  • Scalability: SNS is a highly scalable service that can be used to send millions of messages per second.
  • Durability: SNS is a durable service that will deliver your messages even in the event of a service outage.
  • Reliability: SNS is a reliable service that will not lose your messages.
  • Security: SNS is a secure service that uses industry-standard security protocols to protect your data.
  • Ease of use: SNS is easy to use and can be integrated with a variety of AWS services.

If you are looking for a reliable, scalable, and secure way to send messages to other applications or subscribers, then Amazon Simple Notification Service (SNS) is the perfect solution for you.

Here is a brief explanation of each option:

  • Amazon Elastic Compute Cloud (EC2) is a cloud computing service that provides resizable compute capacity in the cloud. EC2 instances are virtual servers that you can use to run your applications.
  • Amazon Simple Queue Service (SQS) is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications.
  • Amazon Simple Storage Service (S3) is an object storage service that offers industry-leading scalability, data availability, security, and performance.

I hope this helps!