(a) Registration plates issued for motor vehicles shall be valid for an indefinite term of not less than one year. Registration plates issued as two-year or five-year plates may be issued as multi-year plates at the discretion of the Secretary of State. Current renewal registration stickers, when necessary, are to be attached as provided in Section 3-413. The Secretary may in his discretion prescribe a term greater than one year or may extend the term of current registration plates for an additional calendar year by appropriate public announcement made before August 1 of the current registration year.
     (b) Registration plates issued to owners of vehicles subject to annual registration for the first time during the term of the plates shall be valid until the expiration of the term. Current annual registration stickers are to be attached as provided in Section 3-413.