The following entities may legally invest any sinking funds, moneys or other funds in securitized utility tariff bonds:
(a) Subject to applicable statutory restrictions on state or local investment authority, the state, units of local government, political subdivisions, public bodies and public officers, except for members of the commission and the commission's technical advisory and other staff, or board members and employees of the citizens' utility ratepayer board;
(b) banks and bankers, savings and loan associations, credit unions, trust companies, savings banks and institutions, investment companies, insurance companies, insurance associations and other persons carrying on a banking or insurance business;
(c) personal representatives, guardians, trustees and other fiduciaries; or
(d) all other persons authorized to invest in bonds or other obligations of a similar nature.