|(a) An individual may appear in person or by an authorized representative. This right may be waived. (b) Any authorized representative, other than an attorney of record, must produce a written statement executed by the individual they are representing which grants the representative the authority to appear on behalf of the individual. The original or a notarized copy of the authorization must be provided to the board at least three days prior to the appearance of the authorized representative in a proceeding unless waived by the board. (c) A corporation, partnership, or association may appear and be represented by any authorized representative.