If the Packet Forwarding engine (PFE) does not have a route to the destination address of a packet, which action does it take?

If the Packet Forwarding engine (PFE) does not have a route to the destination address of a packet, which action does it take

a) the PFE floods the packet out of all interfaces

b)the PFE drops the packet and sends an ICMP destination unreacheable notification back to the 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 to the routing engine for layer3 lookup.