Answer: Amazon Simple Queue Service (Amazon SQS)

The correct answer is C, Amazon Simple Queue Service (Amazon SQS). SQS is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. It allows applications to send messages to a 'queue', and other parts of the application can process these messages independently. This is particularly useful for an ecommerce company with multiple applications that need to communicate with each other asynchronously. The other options are not designed for this purpose: A (AWS Auto Scaling) is for automatically scaling EC2 instances, B (Elastic Load Balancing) is for distributing incoming application traffic across multiple targets, and D (Amazon Kinesis Data Streams) is for real-time processing of streaming data.

Author: LeetQuiz Editorial Team