In the programmatic method of selling display advertising, how is pricing set?

1. The price of each impression can vary significantly in a real time bidding auction.
2. The price of each impression is guaranteed before the campaign.
3. The price of each impression is fixed and agreed upon.
4. The price of each impression remains constant throughout the campaign.

Correct Answer :

• The price of each impression can vary significantly in a real time bidding auction.