Answer: Amazon WorkSpaces

**Explanation:** Amazon WorkSpaces is the correct AWS service for provisioning fully managed virtual desktops in the AWS Cloud. Here's why: 1. **Amazon WorkSpaces** is a fully managed, secure Desktop-as-a-Service (DaaS) solution that allows you to provision virtual desktops for your users. 2. **Key features of Amazon WorkSpaces:** - Provides persistent, cloud-based virtual desktops - Fully managed by AWS (no infrastructure to maintain) - Supports Windows and Linux desktops - Secure access from multiple devices - Pay-as-you-go pricing 3. **Why the other options are incorrect:** - **AWS Config**: A service for assessing, auditing, and evaluating AWS resource configurations - **Amazon ECS**: A fully managed container orchestration service for running Docker containers - **Elastic Load Balancing**: Distributes incoming application traffic across multiple targets 4. **Use case**: When companies need to quickly provision virtual desktops for new employees without managing the underlying infrastructure, Amazon WorkSpaces is the ideal solution. **Correct Answer: C (Amazon WorkSpaces)**

Author: Ritesh Yadav