At a proceeding at which the Tribunal is constituted by more than one member—
(a) if the President is a member, the President presides;
(b) if the President is not a member but a Vice President is, the Vice President presides or, if there is more than one, then the Vice President nominated by the President for this purpose presides;
(c) if neither the President nor a Vice President is a member but a Deputy President is, the Deputy President presides or, if there is more than one, then the Deputy President nominated by the President for this purpose presides;
(d) if neither the President nor a Vice President nor a Deputy President is a member but a senior member is, the senior member presides or, if there is more than one, then the senior member nominated by the President for this purpose presides;
(e) if the members are all ordinary members, then the member nominated by the President for this purpose presides.