Which of the following is a common problem with proxy servers?

Which of the following is a common problem with proxy servers?
A . Proxy servers do not log incoming and outgoing access, so you will not be able to see details of successful and failed connections.
B . Proxy servers cannot filter out specific application-layer traffic.
C . Proxy servers may return old cached information.
D . Because proxy servers do not mask network resources, hackers may be able to access all exposed systems.

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Answer: C