(a) The board may borrow money at a rate not to exceed the maximum annual percentage rate allowed by law for district obligations at the time the loan is made.
(b) To secure a loan, the board may pledge:
(1) district revenue that is not pledged to pay the district's bonded indebtedness;
(2) a district tax to be imposed by the district in the next 12-month period following the date of the pledge that is not pledged to pay the principal of or interest on district bonds; or
(3) a district bond that has been authorized but not sold.
(c) A loan for which taxes or bonds are pledged must mature not later than the first anniversary of the date the loan is made. A loan for which district revenue is pledged must mature not later than the fifth anniversary of the date the loan is made.