【单选题】
A <{p}>vrrp vrid 1 track bfd-session session-name 1 reduced 100<{/p}>
B <{p}>bfd-session vrrp vrid 1 track session-name 1 reduced 100<{/p}>
C <{p}>vrrp vrid 1 track bfd-session-name 1 reduced 100<{/p}>
D <{p}>track vrrp vrid 1 bfd-session session-name 1 reduced 100<{/p}>
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