Question

_____ are served by ad networks or other customer profiling firms to identify users and record behavior across multiple Web sites.

Answer 1

The answer to this question is Third Party.

Step-by-step explanation:

Third party are actually being served by the other customer profiling firms or the ad networks to identify users and record behavior across multiple Web sites.So we can say that third party is getting the service.

Hence we conclude that the answer to the question is Third Party.