The higher education employer shall grant a request for recognition filed pursuant to

Section unless any of the following occurs: (

a) The employer reasonably doubts that the employee organization has majority support or reasonably doubts the appropriateness of the requested unit. In that case, the employer shall notify the board, which shall conduct a representation election or verify proof of majority support pursuant to

Section unless subdivision (

c) or (

d) applies. (

b) Another employee organization either files with the employer a challenge to the appropriateness of the unit or submits a competing claim of representation within workdays of the posting of notice of the written request. If the claim is evidenced by the support of at least percent of the members of the proposed unit, a question of representation shall be deemed to exist and the board shall conduct a representation election pursuant to

Section 3577. Proof of that support shall be submitted to either the board or to a mutually agreed upon third party. (

c) There is currently in effect a lawful written memorandum of understanding between the employer and another employee organization recognized or certified as the exclusive representative of any employees included in the unit described in the request for recognition, unless the request for recognition is filed not more than days and not less than days prior to the expiration date of the memorandum of understanding, provided that, if the memorandum of understanding has been in effect for three years or more, there shall be no restriction as to the time of filing the request.

The existence of a memorandum of understanding, or current certification as the exclusive representative, shall be the proof of support necessary to trigger a representation election pursuant to

Section to determine majority support when a request for recognition is made by another employee organization. (

d) Within the previous months, either another employee organization has been lawfully recognized or certified as the exclusive representative of any employees included in the unit described in the request for recognition, or a majority of the votes cast in a representation election held pursuant to

Section were cast for “no representation.”