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The traceroute command line tool uses ICMP packets with a TTL field. Generally, when sending the first packet it sends it with a TTL of 1, when it arrives to it's destination the TTL expires and the device we reached sends back a response which is how the path is built using traceroute. In addition, each time the ICMP packet of the traceroute reaches a device and the TTL expires, an additional ICMP packet is sent after the first device responded, with an increased TTL (by 1), until it reaches the destination.
The answer is A.