What is the test for dismissing an appeal on mootness grounds?

As this court has recognized, there are exceptions to the requirement that a court must dismiss a moot appeal. "[T]here are three discretionary exceptions to the rules regarding mootness: (1) when the case presents an issue of broad public interest that is likely to recur [citation]; (2) when there may be a recurrence of the controversy between the parties [citation]; and (3) when a material question remains for the court's determination [citation]." (Cucamongans United for Reasonable Expansion v. City of Rancho Cucamonga (2000) 82 Cal.App.4th 473, 479-480.) A court should apply the third exception if dismissal of the present appeal on mootness grounds will prevent a

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