What will happen in this case for the RI pricing?

An organization has added 3 of his AWS accounts to consolidated billing. One of the AWS accounts has
purchased a Reserved Instance (RI. of a small instance size in the US-East-1a zone. All other AWS accounts are
running instances of a small size in the same zone. What will happen in this case for the RI pricing?

A.
Only the account that has purchased the RI will get the advantage of RI pricing

B.
One instance of a small size and running in the US-East-1a zone of each AWS account will get the
benefit of RI pricing

C.
Any single instance from all the three accounts can get the benefit of AWS RI pricing if they are
running in the same zone and are of the same size

D.
If there are more than one instances of a small size running across multiple accounts in the same
zone no one will get the benefit of RI

Explanation:
AWS consolidated billing enables the organization to consolidate payments for multiple Amazon Web Services
(AWS. accounts within a single organization by making a single paying account. For billing purposes,
consolidated billing treats all the accounts on the consolidated bill as one account. This means that all accounts
on a consolidated bill can receive the hourly cost benefit of the Amazon EC2 Reserved Instances purchased by
any other account. In this case only one Reserved Instance has been purchased by one account. Thus, only a
single instance from any of the accounts will get the advantage of RI. AWS will implement the blended rate for
each instance if more than one instance is running concurrently.