How many g2.2xlarge on-demand instances can a user run in one region without taking any limit
increase approval from AWS?

A.
20

B.
2

C.
5

D.
10

Explanation:
Generally AWS EC2 allows running 20 on-demand instances and 100 spot instances at a time.
This limit can be increased by requesting at https://aws.amazon.com/contact-us/ec2-request.
Excluding certain types of instances, the limit is lower than mentioned above. For g2.2xlarge, the
user can run only 5 on-demand instance at a time.
http://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html#limits_ec2