單項(xiàng)選擇題
An engineer has added the following configuration snippet to an implementation planning document. The configuration will be added to Router R1, whose Fa0/0 interface connects to a LAN to which Routers R2 and R3 also connect. R2 and R3 are already EIGRP neighbors with each of her. Assuming the snippet shows all commands on R1 related to EIGRP authentication, which answer lists an appropriate comment to be made during the implementation plan peer review?（）
key chain fred
key 3
key - string whehew
interface fa0/0
ip authenticat ion key - chain eigrp 9 fred
A.The configuration is missing one authentication - related configuration command
B.The configuration is missing two authentication - related configuration commands
C.Authentication type 9 is not supported; type 5 should be u sed insteaD
D.The key numbers must begin with key 1, so change the key 3 command to key 1
