ARTICLE 6: Response of the defendant

6.1 If the Foundation accepts the Request for Arbitration, the Registrar shall forward a copy of the Request for Arbitration to the defendant at the address indicated in the Request for Arbitration, and at the same time in writing notify the defendant that he is, within 21 calendar days of receipt of the Request for Arbitration, required, by delivery to the Registrar and the claimant, to respond -

6.1.1 to any choice expressed by the claimant as to whether one or three arbitrators should be appointed;

6.1.2 to any choice for a particular arbitrator or arbitrators expressed by the claimant;

6.1.3 if he does not agree to either the number or to the choice of the arbitrator or arbitrators proposed by the claimant, by expressing his own choice of the number of arbitrators and of the particular arbitrator or arbitrators.

6.1.4 by indicating whether he disputes or admits that the arbitration agreement was concluded by him and is still operative for the purposes of arbitration, and whether he disputes or admits that the claim falls within the terms of the arbitration agreement; and, if he does so dispute any of the aforegoing, to set out his grounds for so disputing it;