Answer:
1. Navajo Code Talkers created an unbreakable code. ... The Code Talkers conveyed messages by telephone and radio in their native language, a code that was never broken by the Japanese. "In the early part of World War II, the enemy was breaking every military code that was being used in the Pacific.
4. The code was spoken over wired telephone lines which the Japanese tapped into. The messages might have been broken if the given Navajo speakers were situationally relevant to the message. But being POW's, they were often given the messages to translate removed from the battlefield both by time and distance.
