Gergorio Eliopoulos, a retired railroad employee,received the following form RRB-1099-R. How is the amount reported for the contributory amount paid treated for tax purposes? in box 4 (26,000), box 5,( 13,000)in box 6,(6,000)in box7,(45,000), in box9(9,000)(1) as the gross amount of non- social security equivalent benefits(NSSEB). tier 2 benefits received,reduced by any benefit repaid made during the year.This amount is either partially taxable or fully taxable.(2) As the gross amount of vested dual benefits reduced by repayments.This may reduce the nontaxable portion of his payment.(3) As the amount of prior- year repayments. this may reduce the nontaxable portion of his payment.(4) As Gregorio's investment in the plan. this may reduce the nontaxable portion of his payment.