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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