The suggested answer is B, C.
All guest accounts created using the account registration feature will be placed under the Guest_Portal_Users group, as indicated by the setting 'Place registered users into a group: Guest_Portal_Users'. Guest users must fill in all the fields on the registration form because multiple fields such as 'First name,' 'Last name,' 'Email address,' 'Phone number,' and 'Mobile number' are selected under 'Required field configuration.'