Explanation
When you start a site with a Premium subscription trial to a Cloud product, you automatically create a
"site-admins" group that contains your account as the only member. The "site-admins" group has the site admin role, which allows you to manage the site settings, products, users, and groups. You can also add other users to the "site-admins" group if you want to delegate some of the site administration tasks.
References = Create and update groups and Manage site-level permissions

Explanation
The problem that did not occur for Joe and John is that they could no longer view the billing history. This is because the billing history is not related to the groups or permissions in Jira, but to the organization and site administration. Only the organization admin or the billing contact can view the billing history for the products and subscriptions12 The other problems could have occurred for Joe and John if the group "engineers" had specific permissions or roles in Jira that were not granted to the new groups. For example, if the group "engineers" had the Browse Users global permission, they could select other users in dropdown fields, such as assignee or reporter. If the group "engineers" had the View Dashboard project permission, they could view some dashboards that were shared with the project. If the group "engineers" had the Edit Own Comments issue permission, they could edit their own comments on issues. If the group "engineers" had the Transition Issues issue permission, they could transition issues from one status to another345 References = View your billing history, Manage your bill for Standard and Premium plans, Manage global permissions, Manage project permissions, Manage project roles

Explanation
The only outcome that is not possible for Edmund is that he is granted org admin privileges. This is because org admin privileges are not related to product access or product roles, but to organization settings and management. To grant Edmund org admin privileges, you would need to go to Settings > Organization admins and add him there. The other outcomes are possible depending on the product access settings and the groups that Edmund belongs to.
References = [Give users access to products] and [Manage organization admins]

Explanation
The status "Active" means that the user has an active account and can access the products they have been granted access to1. It does not imply anything about the user's group membership, account type, last login time, or product access.
References:
Manage users in your organization