You have a set of EC2 instances hosted in AWS. You have created a policy and attached it to a role named "DemoRole" created through the CLI. But you are unable to use that role with an instance. Why is this the case?

Answer options:

A.You need to create an instance profile and associate it with that specific role.
B.You are not able to associate an IAM role with an instance.
C.You won`t be able to use that role with an instance unless you also create a user and associate it with that specific role.
D.You won`t be able to use that role with an instance unless you also create a user group and associate it with that specific role.

Answer – A
An instance profile is a container for an IAM role that you can use to pass role information to an EC2 instance when the instance starts.
Option B is invalid because you can associate a role with an instance.
Option C and D are invalid because using users or user groups is not a pre-requisite.
For more information on instance profiles, please visit the link:
http://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2_instance-profiles.html