It is unlawful for an employee organization to do any of the following:
(a) Impose or threaten to impose reprisals on employees, discriminate or threaten to discriminate against employees, or otherwise interfere with, restrain, or coerce employees because of their exercise of rights guaranteed to them by this chapter.
(b) Refuse or fail to meet and negotiate in good faith with the district concerning any of the employees of which it is the exclusive representative.
(c) Refuse to participate in good faith in mutually agreed upon impasse procedures.