Prudence. An insurer shall manage those assets of the insurer which are assets of such insurer's general account (irrespective of whether any such assets are plan assets) with the care, skill, prudence and diligence under the circumstances then prevailing that a prudent man acting in a like capacity and familiar with such matters would use in the conduct of an enterprise of a like character and with like aims, taking into account all obligations supported by such enterprise. This prudence standard applies to the conduct of all insurers with respect to policies issued to plans on or before December 31, 1998, and differs from the prudence standard set forth in section 404(a)(1)(B) of the Act. Under the prudence standard provided in this paragraph, prudence must be determined by reference to all of the obligations supported by the general account, not just the obligations owed to plan policyholders. The more stringent standard of prudence set forth in section 404(a)(1)(B) of the Act continues to apply to any obligations which insurers may have as fiduciaries which do not arise from the management of general account assets, as well as to insurers' management of plan assets maintained in separate accounts. The terms of this section do not modify or reduce the fiduciary obligations applicable to insurers in connection with policies issued after December 31, 1998, which are supported by general account assets, including the standard of prudence under section 404(a)(1)(B) of the Act.