Which of the following services is designed specifically for real-time data processing?

Amazon Kinesis is designed specifically for real-time data processing. It provides capabilities for ingesting, processing, and analyzing streaming data in real time. Kinesis allows users to build applications that can continuously process data such as log and event data, and it supports use cases like real-time analytics, machine learning model inference on streaming data, and automatic remediation based on that data.

In contrast, other services like Amazon S3 and Amazon RDS focus on different functionalities. Amazon S3 is primarily an object storage service for storing and retrieving large amounts of data, while Amazon RDS is a relational database service that is designed for structured data management rather than real-time streaming. Amazon Redshift, on the other hand, is a data warehousing service optimized for analytical querying and reporting, typically working with batch processed data rather than real-time streams.

Kinesis stands out among these options due to its ability to handle and process real-time data streams efficiently, making it the correct choice for services aimed specifically at real-time data processing.