In which ways does the AWS Cloud offer lower total cost of ownership (TCO) of computing resources than on-premises data centers? (Choose two.) A. AWS replaces upfront capital expenditures with pay-as-you-go costs. B. AWS is designed for high availability, which eliminates user downtime. C. AWS eliminates the need for on-premises IT staff. D. AWS uses economies of scale to continually reduce prices. E. AWS offers a single pricing model for Amazon EC2 instances.