(a) The board may borrow money at a rate the board determines is reasonable.
(b) To secure a loan, the board may pledge:
(1) district revenue that is not pledged to pay the district's bonded indebtedness;
(2) tax revenue to be collected by the district in the next 12-month period that is not pledged to pay the principal of or interest on district bonds;
(3) district bonds that have been authorized but not sold; and
(4) any other unencumbered district assets.
(c) The board may use the proceeds of a loan made under this section only for the district's operational and capital requirements.