The Commission may postpone or cancel any examination because of an inadequate number of applicants or for any other just and sufficient cause. The qualifications for admission to a postponed examination may be altered at the discretion of the Commission so as to secure an adequate number of applicants, however, these alterations shall be adequately publicized. Proper notice shall be given to all applicants when an examination is postponed or cancelled and such additional announcements, reannouncements and publications as needed shall be issued to notify the public.