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

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

A) average number of times a user is exposed to an ad 
or 
the average number of times a unique user sees an ad over a given time period 
B) total number of ad impressions
C) average number of times a video ad is played by a user
D) average number of times an ad appears on a single webpage