11. To be authorized to practise in accordance with this Regulation, a member of the Order practising within a partnership or joint-stock company must furnish and maintain security on behalf of the partnership or joint-stock company by means of an insurance or suretyship contract or by joining a group plan contract entered into by the Order, or by contributing to a professional liability insurance fund established in accordance with section 86.1 of the Code, against liabilities of the partnership or joint-stock company arising from fault on the part of members of the Order in the practice of the profession within the partnership or joint-stock company.