Which of the following could not be factor affecting I/…

A user has configured EBS volume with PIOPS. The user is not experiencing the optimal
throughput. Which of the following could not be factor affecting I/O performance of that EBS
volume?

A.
EBS bandwidth of dedicated instance exceeding the PIOPS

B.
EC2 bandwidth

C.
EBS volume size

D.
Instance type is not EBS optimized

Explanation:
If the user is not experiencing the expected IOPS or throughput that is provisioned, ensure that
the EC2 bandwidth is not the limiting factor, the instance is EBS-optimized (or include 10 Gigabit
network connectivity) and the instance type EBS dedicated bandwidth exceeds the IOPS more
than he has provisioned.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html