The following provisions of this section shall apply only to those policies and contracts issued prior to the operative date stated in § 38.2-3214:
6. The legal minimum standard for the valuation of industrial policies issued on and after January 1, 1937, shall be the American Experience Table of Mortality, with interest at three and one-half percent per year; however, any insurer may voluntarily value its industrial policies on the basis of the standard industrial mortality table or the substandard industrial mortality table, and by the level net premium method or in accordance with their terms by the modified preliminary term method as described in subdivision 2, or the full preliminary term method. All industrial policies issued on and after January 1, 1937, shall be valued under the rules set forth in this section, whether or not the policies provide for surrender values, either in cash, paid-up insurance, or extended insurance.