【名词&注释】
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[单选题]When a BGP router is not capable of understanding 4-byte AS numbers, it will see 4-byte AS numbers as aspecial, 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