An ecommerce company plans to move its data center workload to the AWS Cloud to...

The AWS Cloud is cost-effective for dynamic workloads because of its elasticity, allowing resources to scale up or down based on demand, and its pay-as-you-go pricing, which enables companies to pay only for what they use. Reliability, security, and high availability are also benefits of AWS, but they do not specifically relate to cost-effectiveness in the context of dynamic workloads.