Which solution will meet these requirements with the LEAST amount of development work?

Explanations:

While a custom AWS Lambda function can indeed consume records from Kinesis and call the third-party HTTP API, this option involves custom development work. It requires creating, testing, and maintaining the Lambda function, which increases the overall complexity and development time compared to other solutions.

Using an S3 event notification with EventBridge to send data to a third-party HTTP API would still require setting up additional components and involves some level of custom logic to handle the API calls. This solution also does not directly address the requirement to send raw data from the Kinesis data stream.

Creating a Kinesis Data Firehose delivery stream is the most efficient solution. Firehose can directly deliver data to a variety of destinations, including HTTP endpoints, without requiring custom code. This option minimizes development work and leverages managed services to handle the data flow seamlessly.

This option introduces unnecessary complexity by involving S3 event notifications and an SQS queue. It requires additional setup to manage the queue and invoke a Lambda function, which is more development work than needed to meet the requirement of sending data to a third-party HTTP API.