You are creating a report to summarize the number of cars sold by region. Which object should you use to aggregate the number of cars sold?

Sum is an aggregation function that can be applied to a Measure, not an object type you place in a report query.

A Detail object provides descriptive attributes associated with a Dimension and cannot be aggregated numerically.

A Measure is a universe object that holds numeric, quantitative data and is designed to be aggregated across dimension values. When summarizing cars sold by region, a Measure automatically applies its defined aggregation function (such as Sum) to roll up values per regional grouping.

A Dimension object categorizes data (such as Region) and does not store numeric facts intended for aggregation.