You have 2 accounts in your AWS account- one for the Dev and the other for QA. Both accounts are configured using consolidated billing. The management account has purchased 3 reserved instances. The Dev department is currently using 2 reserved instances. The QA department is planning to use 3 EC2 instances. How many reserved instances (purchased by the management account) can be used by the QA Team?

Answer options:

A.No Reserved instance
B.One Reserved instance
C.Two Reserved instances
D.Three Reserved instances

Answer - B
The management account has three reserved instances and two of them are used by Dev department so we have only one reserved instance left that will be used by QA department. The QA team needs three instances so remaining two instances can be added afterwards.
For more information on AWS Reserved instances, please refer to the below URL:
https://aws.amazon.com/ec2/pricing/reserved-instances/