【单项选择题】
While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。
A、A.The port is experiencing errors
B、B.The port is administratively disabled
C、C.The port is blocked by spanning tree
D、D.The port has an active link with normal traffic activity
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