【单选题】
What is the difference between the Ethanalyzer and the SPAN feature in Cisco NX-OS？（）
A、 The Ethanalyzer captures control-plane traffic， while SPAN captures all traffic.
B、 The Ethanalyzer captures all traffic including control-plane traffic， while SPAN captures only the control-plane traffic.
C、 The Ethanalyzer captures only data traffic， while SPAN captures all traffic.
D、 The Ethanalyzer captures only control traffic， while SPAN captures data traffic.
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