There were 500 people in a neighborhood. On Sep 20, 2022, 40 of these 500 people had flu. On Sep 21, 2022, two more people newly developed flu.  Match the options as appropriate (note there are extra options)                                                                                                         Point prevalence of flu on Sep 20, 2022                                                                                                         Population at risk for flu after Sep 21, 2022                                                                                                         Numerator to compute incidence proportion or cumulative incidence of flu on Sep 21, 2022                                                                                                         Denominator to compute incidence proportion or cumulative incidence of flu on Sep 21, 2022                                                                                                         Incidence proportion or cumulative incidence on Sep 21, 2022

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