When running a Demographics report, brands and customer categories need to have 100 or more unique customers in the selected time range to be included in the analysis.

The correct answer is True because when running a Demographics report on Amazon, the data for brands and customer categories is only included in the analysis if there are at least 100 unique customers within the selected time range. This threshold helps ensure that the demographic data provided is statistically significant and reliable, preventing skewed results from being caused by too small a sample size. By setting a minimum of 100 unique customers, Amazon ensures that the insights into customer demographics, such as age, gender, and location, reflect meaningful patterns that can be used for decision-making and targeting strategies.