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Explain In the "water_source" table, which DAX formula would correctly calculate the total number of people served by the source type "well"? SUMX(FILTER(water_source, water_source[type_of_water_source] = "well"), water_source[number_of_people_served]) FILTER(water_source, water_source[type_of_water_source] = "well") * SUM(water_source[number_of_people_served]) CALCULATE(SUM(water_source[number_of_people_served]), water_source[type_of_water_source] = "well") SUMMARIZE(water_source, water_source[type_of_water_source] = "well", "Total People Served", SUM(water_source[number_of_people_served]))?