; (2) the Authority shall, for employees who, on the date of enactment of this Act, have accumulated a total of 5 years of employment with the Authority, devise a system which limits those enrolled in the Authority’s pension plan to having not more than 100 percent of base annual salary as the amount counted toward the highest salary level for purposes of calculating pension benefits; (3) the Authority may, with respect to those employees who were hired before the date of enactment of this Act but who had yet to accumulate a total of 5 years of employment with the Authority, determine a benefits plan which may include a combination of a defined benefit and a defined contribution