Answer:

Explanation:
A computer network is a network of computers that can share data among the computers.
The correct answer is:
Cross-domain tracking
Explanation and more info in http://www.certificationanswers.com/en/if-you-want-to-track-users-and-sessions-across-multiple-domai....
When reading difficult content you should- Survey the chapter.
Surveying the chapter allows you to better interpret the literary text and therefore be able to answer the following questions or summarize.
Hope I helped,
-CSX :)
It makes the possibility of an unwanted user to break into your account much smaller.