单项选择题
You are the Cisco Network Designer in Cisco.com. Which statement is correct regarding NBAR and NetFlow?（）
A. NBAR examines data in Layers 1 and 4.
B. NBAR examines data in Layers 3 and 4.
C. NetFlow examines data in Layers 3 and 4.
D. NBAR examines data in Layers 2 through 4.
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