(a) In its decision the Board shall affirm, modify, vacate or reverse the decision or order appealed from, and may remand the case for action or proceedings consistent with the decision of the Board. The consent of the parties shall not be a prerequisite to a remand ordered by the Board.

(b) In appropriate cases, such as where the issues raised on appeal have been thoroughly discussed and disposed of in prior cases by the Board or the courts, or where the findings of fact and conclusions of law are both correct and adequately discussed, the Board in its discretion may issue a brief, summary decision in writing, disposing of the appeal.

(c) In cases which cannot be disposed of as in paragraph (b) of this section, a full, written decision discussing the issues and applicable law shall be issued.