单选题When debugging a routing problem, the time-to-live (TTL) value can be used to determine:（）ANumber of routes available.BNumber of router hops.CTime that an advertised route is valid.DTime to make a round trip.
单选题
When debugging a routing problem, the time-to-live (TTL) value can be used to determine:（）
A
Number of routes available.
B
Number of router hops.
C
Time that an advertised route is valid.
D
Time to make a round trip.
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