How does consolidated billing help reduce costs for a company that has multiple AWS accounts?

A. It aggregates usage across accounts so that the company can reach volume discount thresholds sooner.
B. It offers an additional 5% discount on purchases of All Upfront Reserved Instances.
C. It provides a simplified billing invoice that the company can process more quickly than a standard invoice.
D. It gives AWS resellers the ability to bill their customers for usage.