•   Certain courts may set aside a child support agreement or a termination agreement if:

  (a)   the agreement of one of the parties was obtained by fraud, undue influence or unconscionable conduct; or

  (b)   there has been a significant change in circumstances; or

  (c)   the annual rate of child support payable under the agreement is not proper or adequate; or

  (d)   exceptional circumstances arise after the agreement is made.