A technician receives a report of network slowness and the issue has been isolated to the interface FastEthemet0/13. What is the root cause of the issue?

A technician receives a report of network slowness and the issue has been isolated to the interface FastEthemet0/13.
What is the root cause of the issue?

A. local buffer overload B. err-disabled port on the far end C. physical errors D. duplicate IP addressing