Message Retention and Reliability

Correct Answer: FIFO Queue

The correct answer is FIFO Queue because it guarantees exactly-once processing and maintains the order of messages. Standard Queue doesn't guarantee message ordering, and Short Polling, Long Polling, SNS Topic, and Dead Letter Queue are not relevant for this scenario.

Correct Answer: Create a Dead Letter Queue (DLQ) and attach it to the Amazon SNS topic

The correct answer is to create a Dead Letter Queue (DLQ) and attach it to the Amazon SNS topic. This will capture failed messages, allowing analysis and debugging. Increasing the visibility timeout, enabling long polling, and enabling retry policies are SQS features not applicable to SNS. Creating a Kinesis Data Stream or an S3 bucket for failed messages requires custom implementation and is not the best solution.

Correct Answer: Enable Content-Based Deduplication on a FIFO Queue

The correct answer is to enable Content-Based Deduplication on a FIFO Queue, as it will remove duplicates using the message content. Enabling Content-Based Deduplication on a Standard Queue is not possible; it's only supported by FIFO Queues. Long and Short Polling don't provide deduplication functionality. High Visibility Timeout doesn't guarantee deduplication. DLQ captures failed messages and is not directly related to deduplication.