Answer: Amazon SQS

The correct answer is B, Amazon Simple Queue Service (Amazon SQS). Amazon SQS is a fully managed message queuing service provided by AWS that enables decoupling of microservices, distributed systems, and serverless applications. It allows different components of an application to communicate asynchronously by sending and receiving messages, which helps in improving the overall flexibility and fault tolerance of the application architecture. The other options are not designed for decoupling applications: A (AWS Config) is for monitoring and auditing AWS resource configurations, C (AWS Batch) is for running batch computing jobs, and D (Amazon SES) is for sending email messages.

Author: LeetQuiz Editorial Team