How must a Palo Alto Networks Next-Generation Firewall (NGFW) be configured in order to secure traffic in a Cisco ACI environment?

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How must a Palo Alto Networks Next-Generation Firewall (NGFW) be configured in order to secure traffic in a Cisco ACI environment?
A . It must be deployed as a member of a device cluster.
B . It must use a Layer 3 underlay network.
C . It must receive all forwarding lookups from the network controller.
D . It must be identified as a default gateway.

Answer: B