Valuation of other securities.

A. Common stocks shall be valued at their market value, as determined by customary method, or, at the option of the company, they may be carried at cost if cost is less than market value. If no publicly traded market quotation is available, the value of the stocks shall be based on the pro rata share of the issuing company's net worth as shown by its audited financial statements or, in the case of an insurance company, the pro rata share of its statutory net worth. B. Preferred stocks shall be valued in accordance with procedures promulgated periodically by the securities valuation office of the national association of insurance commissioners. C. Stock of an insurer's subsidiary shall be valued only on the basis of value of the assets of the subsidiary that would constitute lawful investments of the insurer if acquired or held directly by the insurer.