Which of the following best describes website mirroring?

Website mirroring refers to the process of creating a duplicate of an existing website for various purposes, such as backup, testing, or replication in a different environment. This technique is often employed to ensure that a website can be restored in case of data loss, to conduct tests without affecting the live site, or to provide a similar experience in a different geographical location or server.

In some cases, mirroring can be used for legitimate purposes like reducing load times through a Content Delivery Network (CDN) or to improve redundancy in disaster recovery plans. The context of mirroring entails maintaining the original website's structure, content, and sometimes even its functionality, making option B the best description of website mirroring.

The other options do not accurately capture the essence of mirroring. For instance, permanently deleting a website's content is the opposite of mirroring, while enhancing security measures does not necessarily involve duplicating a site. Changing a website's design without permission might refer to unauthorized modifications, which does not relate to mirroring's fundamental concept of creating a duplicate copy.