问题：
[单选题]When a BGP router is not capable of understanding 4-byte AS numbers， it will see 4-byte AS numbers as a special， reserved， 2-byte AS number in the AS path. Which 2-byte AS number is this reserved one？（）
A、00000
B、12345
C、23456
D、65000
E、99999
参考答案：
C
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