(a) Employee organizations recognized by the public school employer as the exclusive representative of all public school employees in a specified unit on July 1, 1978 shall continue to be the exclusive representative:
(1) For the rest of the 2-year initial period as provided by § 6-507 of this subtitle; and
(2) Beyond the 2-year period until another election is held as provided under § 6-507 of this subtitle.
(b) Any collective negotiation agreement that has been entered into by an exclusive representative and a public employer as of July 1, 1978 shall continue in effect for the term of the agreement.