(b) The answer shall be so drawn as to advise the petitioner and the board of the nature of the defense, in reasonable detail. It shall contain a specific admission, denial, or explanation of each of the material facts alleged in the petition. Such a denial may be upon information and belief or a denial of knowledge or information sufficient to form a belief as to the truth of the allegation. The answer must also contain a statement of any facts upon which the commissioner relies for an affirmative defense.

1. (1) The commissioner shall serve one copy of the answer upon each petitioner or attorney of record and shall file the original with the board, with proof of such service.
2. (2) If a representative of petitioner’s employee is named in the petition, the commissioner shall also serve, by mail, one copy upon such representative and shall file with the board proof of such service.

(c)