Except as provided in subsection (b) of this section, the Board shall certify as exclusive representative the employee organization receiving the votes in an election from a majority of the employees voting in the election. After notice and an opportunity for a hearing, the Board may deny or revoke certification as exclusive representative of an employee organization for willful failure to comply with this title. Notwithstanding any other provision of this subtitle, the Board shall certify the employee organization as the exclusive representative without an election if: a petition for an exclusive representative has been filed for a bargaining unit; the Board finds that a majority of the employees in the bargaining unit have signed valid authorizations designating the employee organization as their exclusive representative; and no other employee organization is currently certified or recognized as the exclusive representative of the bargaining unit.