SmartZone uses an Account Name@Domain username convention when an administrator logs in to a Partner Domain. The account name identifies the administrator account, while the portion following the @ symbol identifies the Partner Domain to which the account belongs. For example, RUCKUS documentation shows that if an administrator account named User belongs to the Partner Domain TestDomain, the login username is User@TestDomain. Applying the same rule here, an administrator account named Team01 Admin in the Team01 Partner domain must log in as Team01 Admin@Team01 Partner. Reversing the administrator and domain names, combining them without the domain delimiter, or adding a hyphen does not follow the required SmartZone Partner Domain authentication format. Therefore, option A is correct. rcw 3 Ruckus Wireless Documentation

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