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.

Explanation: