After making such preliminary investigation as the General Counsel may deem appropriate, the General Counsel shall either (1) notify the person filing the grievance and the lawyer that the allegations of the grievance are inadequate, incomplete, or insufficient to warrant the further attention of the Commission, provided that such action shall be reported to the Commission at its next meeting, or (2) file and serve a copy of the grievance (or, in the case of an investigation instituted on the part of the General Counsel or the Commission without the filing of a signed grievance, a recital of the relevant facts or allegations) upon the lawyer, who shall thereafter make a written response which contains a full and fair disclosure of all the facts and circumstances pertaining to the respondent lawyer's alleged misconduct unless the respondent's refusal to do so is predicated upon expressed constitutional grounds. Deliberate misrepresentation in such response shall itself be grounds for discipline. The failure of a lawyer to answer within twenty (20) days after service of the grievance (or recital of facts or allegations), or such further time as may be granted by the General Counsel, shall be grounds for discipline. The General Counsel shall make such further investigation of the grievance and response as the General Counsel may deem appropriate before taking any action.