An advertiser using cost-per-thousand impressions (CPM) bidding wants to maximize exposure on a specific set of sites that have been selected for a new campaign. Which is a best practice that this advertiser should employ when setting up the new campaign?

An advertiser using cost-per-thousand impressions (CPM) bidding wants to maximize exposure on a specific set of sites that have been selected for a new campaign. Which is a best practice that this advertiser should employ when setting up the new campaign?

Answer -  set bids at the group or campaign levels