Exam AWS Certified Cloud Practitioner CLF-C02 topic 1 question 188 discussion

A: AWS Step Functions is used to coordinate components of distributed applications using workflows, not for message queuing. B: Amazon SNS is a pub/sub messaging service, but it does not guarantee FIFO message processing. C: Amazon Kinesis Data Streams is used for real-time data streaming and analytics, not for general-purpose messaging with strict FIFO. D: Amazon SQS (specifically the FIFO queue type) is designed to send, store, and receive messages in order, ensuring first-in, first-out processing.

D for sure

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/welcome.html

Amazon SQS FIFO queues preserve the order in which messages are sent and received, and avoid that a message is processed more than once. This ensures that the messages are processed in first-in, first-out (FIFO) order1.