单选题You are the Cisco Network Designer in Cisco.com. Which statement is correct regarding NBARand 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.
单选题
You are the Cisco Network Designer in Cisco.com. Which statement is correct regarding NBARand 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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