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