You work as a network engineer at domain .com. Study the topology exhibit carefully. Host domain .com 1 and Host domain .com 2 are on Ethernet LANs in different buildings. A serial line is installed between two Cisco routers using Cisco HDLC serial line encapsulation. Routers domain .com A and domain .com B are configured to route IP traffic. Host domain .com 1 sends a packet to Host domain .com 2. A line hit on the serial line causes an error in the packet. When this is detected, the retransmission is sent by:
Exhibit:

A.
Host domain .com 1

B.
Host domain .com 2

C.
Router domain .com A

D.
Router domain .com B

E.
Protocol analyzer