An organization is trying to create various IAM users. Which of the below mentioned options is not
a valid IAM username?

A.
John.cloud

B.
john@cloud

C.
John=cloud

D.
john#cloud

Explanation:
AWS Identity and Access Management is a web service which allows organizations to manage
users and user permissions for various AWS services. Whenever the organization is creating an
IAM user, there should be a unique ID for each user. The names of users, groups, roles, instance
profiles must be alphanumeric, including the following common characters: plus (+., equal (=.,
comma (,., period (.., at (@., and dash (-..