Which statement describes the operation of the Generalized TTL Security Mechanism (GTSM), used by routing protocols to prevent some type of attack?

Which statement describes the operation of the Generalized TTL Security Mechanism (GTSM), used by routing protocols to prevent some type of attack?
A . An MD5 hash of the received TTL, source IP, destination IP, protocol, and shared key must match
B . The TTL in a received packet must be a low value (typically 1 – 2)
C . The TTL in a received packet must be a high value (typically 254 – 255)
D . Both end systems compute an MD5 hash based on the TTL and a shared secrete If the received and local value differ, the packet is dropped

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Answer: C