Which of the following is true of distributable net income (DNI) (1) It is computed by reference to the treatment of items as principal or income under the applicable state principle and income act (2) It is only necessary to be computed for a complex trust (3) It is computed starting with taxable income of the trust or estate and making adjustments specified by the Internal Revenue Code (4) It serves to compute the minimum income distribution deduction a trust or an estate must claim on the Form 1041