單項選擇題Router R1 has been conf igured with an ipv6 route 2000::/64 S0/0/0 64 command.Which of the following does the 64 at the end of the command represent?()

A. Metric
B. Administrative distance
C. Timeout (seconds)
D. Prefix length
E. Interface ID


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A. The method of choosing an OSPF router ID
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C. Support for route tags
D. Support for multiple instances per inter face

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