B.
Alternate members of Classes II and III shall be appointed for terms to expire at the same time as the terms of regular members of their respective classes.
C.
Alternate members of Class IV shall serve for terms of two years; provided, however, that in the event that two alternate members of Class IV are appointed, the initial terms of such members shall be one and two years respectively. Such alternate members shall be designated by the Chairman as "Alternate No. 1" and "Alternate No. 2" and shall serve in rotation during the absence or disqualification of any regular member or members of Class IV.
D.
Alternate members of each class shall be appointed by the same appointing authority as regular members of that class.