Corporations and partnerships may engage in the business of contracting; provided, that at least one (1) of the major stockholders or partners or full-time employees with a written power of attorney to bind the corporation or partnership has sufficient knowledge of the construction business in which the persons are licensed to perform. If the person who took the examination for the partnership or corporation leaves the firm for any reason, the partnership or corporation must designate an individual to take the examination within three (3) months.