2422.2—Standing to file a petition.
         A representation petition may be filed by: an individual; a labor organization; two or more labor organizations acting as a joint-petitioner; an individual acting on behalf of any employee(s); an agency or activity; or a combination of the above: Provided, however, that
    
    
    
    
        
        (c) 
         Only an agency or a labor organization may file a petition pursuant to  section 2422.1(b) or (c).