Final answer:
Amazon SQS supports PUB SUB messaging as a queue service but typically requires integration with Amazon SNS for full PUB SUB capabilities. The other services listed are database and data warehousing services and don't provide PUB SUB messaging functionality.
Step-by-step explanation:
The AWS service that supports PUB SUB messaging is Amazon SQS (Simple Queue Service). PUB SUB, short for publish-subscribe, is a messaging paradigm where messages are published to a topic by a producer (publisher) and then made available to any number of consumers (subscribers) who have subscribed to that topic.
Amazon SQS allows for decoupled components of a cloud application to communicate asynchronously, using messages that are stored in queues. However, to fully support publish-subscribe messaging patterns directly, you would typically use Amazon SNS (Simple Notification Service), which is designed for this purpose but is not one of the options provided. While Amazon SQS supports message queuing which can be part of a PUB SUB system when combined with SNS, on its own it doesn't provide direct publish-subscribe capabilities.
It's important to clarify that none of the other options listed (Amazon RDS, Amazon DynamoDB, and Amazon Redshift) are messaging services. They are, respectively, a relational database service, a NoSQL database service, and a data warehousing service.