(A) Using IFRAMEs with keywords to alter the content or language of the ads.
(B) Placing Google ads in a “floating box” in which ads scroll, hover, or expand over the webpage.
(C) Adding irrelevant keywords (hidden or visible) to alter the targeting of the ads.
(D) Hiding an unit if it is a responsive ad unit.
This question is a part of the Adsense Multiple Customer Management Exam. You can find answers to all the questions asked in this exam in our Adsense Multiple Customer Management Exam Answers page.