If:
(a) this Act provides for a person to apply to a * decision maker to make a * reviewable decision; and
(b) a period is specified under this Act for giving notice of the decision to the applicant; and
(c) the decision maker has not notified the applicant of the decision maker's decision within that period;
the decision maker is taken, for the purposes of this Act, to have made a decision to reject the application.