There is a TTL field in the header of the IP packet. Which of the following statement about this field is correct?

There is a TTL field in the header of the IP packet. Which of the following statement about this field is correct?
A . This field is used to indicate the priority of the packet.
B . The length of this field is 7 digits.
C . This field is used for packet anti-ring.
D . This field is used for packet fragmentation.

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Answer: C