A company is building a game system that must send unique events concurrently to separate leaderboard, matchmaking, and authentication services. The system must also guarantee the order of events. Which solution meets these requirements?

Amazon SNS FIFO topics are the correct choice because they guarantee message ordering and support fan-out to multiple subscribers, which aligns with the requirement to send unique events concurrently to separate services while maintaining order. Each subscriber (leaderboard, matchmaking, authentication) would receive messages in the exact order they were published. Amazon EventBridge event bus provides fan-out but does not guarantee message order. Amazon SNS standard topics also offer fan-out but do not guarantee message order. Amazon SQS FIFO queues guarantee order but are a point-to-point messaging service, meaning a single queue would not concurrently send the same message to multiple distinct services directly; it would require multiple queues or additional fan-out mechanisms.