rovided for in Section 1606, shall have the right to cancel any option previously elected by him or her pursuant to the provisions of this subsection. The Board shall by rule provide for a method in which the election to receive an optional pension shall be exercised. (c) Additional Pension Amounts. Whenever any Plan Member or Retired Plan Member shall die and leave surviving him or her, in addition to a Qualified Surviving Spouse, a Minor Child or Children or a Dependent Child or Children of his or her marriage to the Qualified Surviving Spouse, then such Qualified Surviving Spouse, shall be paid an additional monthly pension in an amount which shall be equal to 25% of the pension he or she as a Qualified Surviving Spouse would be entitled to pursuant to the provisions of subsection (a) of this section while there is one Minor Child or Dependent Child, 40% while there are two Minor Children or Dependent Children or a combination thereof, and 50% while there are three or more Minor Children or Dependent Children or a combination, and such additional monthly pension shall be the exclusive property of such Qualified Surviving Spouse and not the property of any such Minor Child or Dependent Child. Whenever any Plan Member or Retired Plan Member shall die and leave surviving him or her in addition to a Qualified Surviving Spouse, a Minor Child or Children or a Dependent Child or Children of his or her marriage to a former spouse, then the guardian or guardians of the estate or estates of any such Minor Child or Children or Dependent Child or Children shall be paid a monthly pension in an amount which shall be equal to 25% of the pension the Qualified Surviving Spouse would be entitled to pursuant to the provisions of subsection (a) of this section while there is one Minor Child or Dependent Child, 40% while there are two Minor Children or Dependent Children or a combination, and 50% while there are three or more Minor Children or Dependent Children or a combination.