Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true?（）
- A Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.
- B Router C will use ICMP to inform Router B that Host 2 cannot be reached.
- C Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.
- D Router C will send a Destination Unreachable message type.
- E Router C will send a Router Selection message type.
- F Router C will send a Source Quench message type.