- Elapsed time interacting with a creative element
- Length of time a video creative is played
- Number of users that did not interact with a creative
- Number of times an action is taken within a creative
The correct answer is: Number of times an action is taken within a creative
Explanation: This custom metric counts the number of times that a user interacts with any part of a Rich Media ad in a specified way (mouse-overs, mouse-outs, click-ins, data loading, keyboard entries, etc.). Anything that can be captured by the creative code can be recorded with a counter.
Read more here:https://support.google.com/richmedia/answer/2824547