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.