An ecommerce company is migrating data-center workloads with highly variable usage to AWS. Which benefits of AWS make this type of migration cost-effective? (Choose two.)

Elasticity allows the company to automatically scale resources up or down based on highly variable usage, ensuring they only pay for what they need at any given time. This directly addresses the cost-effectiveness for fluctuating workloads. The pay-as-you-go resource model complements elasticity by charging only for the actual consumption of resources, eliminating the need for large upfront investments and reducing operational costs associated with maintaining idle capacity for peak loads. Reliability, security, and high availability are important benefits of AWS but do not primarily address the cost-effectiveness of migrating workloads with highly variable usage as directly as elasticity and the pay-as-you-go model do.