The amount of the present value of options shall be the amount which, in the opinion of the liquidator, is necessary to be provided at the liquidation date (in addition to the amount of the present value of the ordinary benefits) to cover the additional liabilities likely to arise upon the exercise on or after that date by the policy holder of any option conferred upon him by the terms of the policy or, in the case of an industrial assurance policy, by the Industrial Assurance Acts other than an option whereby the policy holder can secure a guaranteed cash payment within the period of 12 months beginning with that date.