Which of the below mentioned options is not a valid IAM username?

Explanations:

“John.cloud” is a valid IAM username as it meets the criteria of including letters, numbers, and symbols.

“john@cloud” is a valid IAM username because it contains permissible characters like letters and symbols.

“John=cloud” is a valid IAM username since it uses valid characters (letters and the equals sign).

“john#cloud” is not a valid IAM username because the ‘#’ character is not allowed in IAM usernames.