Which two statements about NetFlow support on Cisco IOS XR are true? (Choose two.)

Which two statements about NetFlow support on Cisco IOS XR are true? (Choose two.)
A . Cisco IOS XR supports NetFlow version 9 export format only.
B . NetFlow version 9 is a flexible and extensible means to carry NetFlow records from a network node to a collector.
C . IP flow is based on a set of four parameters only (source IP address, destination IP address, source port, and destination port).
D . A NetFlow flow is the bidirectional sequence of packets on a single interface.

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Answer: A,B