A company wants to centralize AWS billing across its 15 accounts so it can benefit from volume discounts and Reserved Instance sharing. Which AWS feature enables this?
Show answer and explanation
Answer: B
Consolidated billing under AWS Organizations rolls every member account's usage into a single payer invoice, which unlocks volume-discount tiers based on combined usage and automatically applies Reserved Instances and Savings Plans bought by any member account to matching usage in all accounts. The payer still sees per-account breakdowns in Cost Explorer.
Why the other options are wrong
- A. RAM shares specific resources such as subnets and Transit Gateway attachments between accounts; it has no billing aggregation role.
- C. Control Tower provisions and guards a multi-account environment, but the billing consolidation itself is the Organizations consolidated-billing feature it depends on, not Control Tower.
- D. License Manager tracks and enforces software license usage; Amazon invoice consolidation and RI sharing are not part of it.
Exam tip. Consolidated billing = pooled volume discounts plus automatic RI and Savings Plans sharing across member accounts.