Final answer:
Impressions on site-served creatives are counted using a 1x1 impression tracker and tracking ads, not through mobile tracking ads or click tracker ads.
Step-by-step explanation:
The methods used to count impressions on site-served creatives are the 1x1 impression tracker and tracking ads. A 1x1 impression tracker, also known as a pixel tracker or a web beacon, is a small, transparent, single-pixel image that is added to a webpage or email to monitor the behavior of the user interacting with the webpage or email.
It counts each time the pixel is loaded as an impression. On the other hand, tracking ads utilize ad tracking software embedded in the ad itself to record the number of times an advertisement is served and viewed on a user's screen.
Mobile tracking ads and click tracker ads, while important in the realm of digital advertising, are not specifically designed to count impressions.
A mobile tracking ad focuses more on the performance and engagement within mobile devices, and a click tracker ad measures the clicks an ad receives, rather than impressions.
The two methods that count impressions on site-served creatives are the 1x1 impression tracker and the tracking ads.
1) Mobile tracking ad is not a method to count impressions on site-served creatives. It is used to track user interaction with mobile ads.
2) Click tracker ad is also not a method to count impressions on site-served creatives. It is used to track user clicks on ads.