Which Is NOT a Good Reason to Configure User Authentication

Which is NOT a good reason to configure user authentication when deploying ProxySG as an Internet gateway proxy?

A) To allow creation of granular polices by user or group
B) To allow more detailed logging and reports
C) To enable more convincing coaching pages for AUP violations
D) To ensure that cache content is not expired
E) To protect against unauthorized access of Web objects found in cache