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单选题
Host 1 sends an ICMP echo request to remote sever1. Layer2 header of the frame containing the ping packet（）。
A
The IP address of sever 1.
B
The MAC address of NIC in sever 1.
C
The IP address of F0/0 interface of router R1.
D
The MAC address of the Fa0/0 interface of router R1.
E
The IP address of the s0/0/0 interface of router R2
F
The MAC address of the s0/0/0 interface of router R2
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