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.