(a) Any public agency which is a responsible agency for a development project that has been approved by the lead agency shall approve or disapprove the development project within whichever of the following periods of time is longer:
(1) Within 180 days from the date on which the lead agency has approved the project.
(2) Within 180 days of the date on which the completed application for the development project has been received and accepted as complete by that responsible agency.
(b) At the time a decision by a lead agency to disapprove a development project becomes final, applications for that project which are filed with responsible agencies shall be deemed withdrawn.