Which action does the router take as it forwards a packet through the network?

Which action does the router take as it forwards a packet through the network?
A . The router replaces the source and destination labels with the sending router interface label as a source and the next hop router label as a destination
B . The router encapsulates the source and destination IP addresses with the sending router IP address as the source and the neighbor IP address as the destination
C . The router encapsulates the original packet and then includes a tag that identifies the source router MAC address and transmit transparently to the destination
D . The router replaces the original source and destination MAC addresses with the sending router MAC address as the source and neighbor MAC address as the destination

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Answer: D