Where would I add boundary and control classes to this diagram? and also which ones would be considered a entity class?

Department Chair Department +Add course Update course sections Assign instructor usit of Course +Course Name +Cous NumberofCredit Add section +CheckPrerequiste Section Date +StartTime EndTime +Mode Location Check schedule conflict Preference +Date entered +Date preferred Time prefered Registration Date Added Date Dropped Instructor +UIN +Email +Office Phone t preference Student +UIN +Name +Register +Drop 0 Pay Payment +Date Paid. +lamount Paid CreditCardNumber