Jon is a new Jira user. He reports that adding comments to Jira isn't working as expected. When he attempts to @mention a user, no list of available users is provided. Because he does not know everyone's username, he is unable to target comments to specific users.
What is the cause of this problem?
Jon's issue stems from not having the Browse Users global permission. This permission is necessary for seeing and mentioning other users in Jira. Without it, he cannot access the list of available users and thus cannot @mention them in comments. The problem does not relate to project-specific permissions, field security, or field configuration settings.
It should be A
According the same reference link privde at the bottom it should be A