A. Modify the target population query to not include the control group.

B. Use the out of the box control group functionality with Random Sampling and Data Grouping.

C. Use a query activity to query the target population and another query activity to obtain the desired control group. Then use an exclusion activity to get the exclusive target.

D. Use a query activity to obtain the target population and send to a split activity to remove each age group with record count limitation set as random.