Which two guidelines and limitations of NetFlow on Cisco NX-OS are true? (Choose two)

Which two guidelines and limitations of NetFlow on Cisco NX-OS are true? (Choose two)
A . If you change a layer 2 interface to a layer 3 interface, the software converts the layer 2 NetFlow to layer 3 NetFlow automatically.
B . It is optional to configure a valid record name
C . The cisco nexus 2000 series fabric extender does not support bridged NetFlow.
D . Only layer 2 NetFlow is applied on layer 2 interfaces, and only layer 3 NetFlow is applied on layer 3 interfaces.
E . You must configure a source interface. If you do not configure a source interface, the exported remains in a disabled state.

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Answer: DE