(a) The court may modify a child support award subsequent to the filing of a motion for modification and upon a showing of a material change of circumstance.
(b) The court may not retroactively modify a child support award prior to the date of the filing of the motion for modification.
(c) If a party becomes incarcerated, the court may determine that a material change of circumstance warranting a modification of child support has occurred, provided that the party’s ability to pay child support is sufficiently reduced due to incarceration.