Answer: C
Explanation: The gateway of last resort routes packets with unknown destinations.
(A) ❌ Root Internet servers handle DNS, not packet routing.
(B) ❌ BGP manages routing between autonomous systems, not individual packets.
(C) ✅ Gateway of last resort forwards packets when no specific route exists.
(D) ❌ Reverse DNS resolves IP addresses to domain names, unrelated to routing.
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