A company runs a microservices-based e-commerce application on AWS. During peak hours, the order processing service often gets overwhelmed because the web frontend sends requests directly to it. This causes delays and occasional failures. The architecture team needs to decouple the frontend from the order processing service by introducing a fully managed, highly available, and durable message queue. The queue must automatically replicate messages across multiple Availability Zones and allow the order processing service to pull messages at its own pace. Which AWS service should the company use?