How do you configure the report definition?

A list report includes columns for purchase requests and regional cost centers. A manager wants the report to show the total number of purchase requests for each of the regional cost centers.

How do you configure the report definition?
A . Use the purchase requests column to group the cost centers.
B . Filter the results so that only cost center and purchase requests are included in the report.
C . Summarize the regional cost centers by count.
D . Summarize the purchase request column by count.

Answer: D