Answer: (D) Content delivery networks
Explanation:
Content delivery network is defined as the collection of various types of web server for delivering the content to the users that are distributed worldwide at the different locations more efficiently.
The main aim of the CDN (Content delivery network) is that it provide the high performance and the availability by distributed the various types of services to the users.
It also helps in improving the overall speed of the delivery of the web page and the various other types of media to the user at the multiple locations.
Therefore, Option (D) is correct.