In a Reach and Frequency report, “Reach” is defined as the:

 In a Reach and Frequency report, “Reach” is defined as the: 

A) distance between a user exposed to an ad and the business location of the advertiser
B) demographic populations to which an ad is served
C) geographic locations in which an ad is served
D) number of unique users exposed to an ad 
or 
an estimate of the number of users exposed within a selected location target, based on unique cookies