Which is true of reserve ads?

1. Because impressions are guaranteed, advertisers are charged a variable rate.
2. Because impressions cannot be guaranteed, advertisers are charged a variable rate.
3. Because impressions are guaranteed, advertisers are charged a fixed rate.
4. They can only be sold and served via Google’s Ad Exchange, or AdWords for video.

Correct Answer:

• Because impressions are guaranteed, advertisers are charged a fixed rate.