Which of the following descriptions about content delivery network CDN is wrong?

Which of the following descriptions about content delivery network CDN is wrong?
A . Improved the response speed and availability of websites for users
B . CDN is a layer of intelligent virtual network built on the existing Internet
C . It solves the problems of large user traffic and uneven distribution of network points, but at the same time increases the load on network bandwidth
D . Deploy node servers throughout the network to distribute the source site content to all CDN nodes

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Answer: C