Referring to the exhibit, a packet destined to 172.129.3.5 is sent from ISP X towards R1.
Which statement describes how R1 handles the packet?
A.
It sends ICMP network unreachable messages back to the source.
B.
It forwards the packet towards Network A.
C.
It silently drops the packet and does not send a message back to the source.
D.
It forwards the packet towards Network C.