单项选择题IfthePFEdoesnothavearoutetothedestinationaddressofapacket,whichactionwillbetaken?()
A.The PFE floods the packet out of all interfaces.
B.The PFE drops the packet and sends a destination unreachable notification back to source device.
C.The PFE forwards the packet to the routing engine for further processing.
D.The PFE queues the packet and sends a request for a layer 3 lookup to the routing engine.