- Mobile Web
- Desktop Web on Mobile
- Mobile App
The correct answer is: Mobile App
Explanation: Proximity targeting is limited to mobile app inventory. Use proximity targeting to search for business chains, individual points of interest (POIs), street addresses, and latitude/longitude coordinates. Also paste in a line separated list of street addresses and latitude/longitude coordinates.
Read more here: https://support.google.com/displayvideo/answer/2705812