Which of the following protocols is NOT supported by SNS?

The correct response identifies the protocol that is not supported by Amazon Simple Notification Service (SNS). Amazon SNS is a fully managed messaging service that allows developers to send messages to multiple subscribers and endpoints using various protocols.

SNS supports a range of protocols including:

• Amazon SQS (Simple Queue Service): SNS can deliver messages to SQS queues, allowing for decoupled message processing.
• HTTP/S: This protocol lets SNS send notifications directly to a web server by making HTTP POST requests to the specified endpoint.
• Email: SNS also provides the capability to send messages via email to subscribers.

On the other hand, the term "FPS" refers to the Flexible Payment Service, which is not related to SNS functionality. Therefore, it is correct to conclude that FPS is not a supported protocol within Amazon SNS, as the service does not facilitate payment processing or notifications using this protocol. This understanding reinforces the knowledge of supported messaging patterns and protocols within the AWS ecosystem.