I think that it is number 4
The codes developed by the Navajo nation code talkers enabled the Americans to communicate during the times of World War II which was not understood by the Japanese people.
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What is Navajo?</h3>
Navajo is a complex language used by American individuals for communication in the era of World war II. It is developed in the coded language by the Navajo code talkers.
During WW II, the Navajo people were hired by the US who helped them to exchange important information in terms of Navajo Codes which were not easily interpreted by the Japanese people. They served the Americans as code talkers which finally enabled them to make conclusive moves to the area of the pacific ocean.
Therefore, the Americans can communicate easily through the codes developed by the Navajo code talkers which were not cracked by the Japanese.
To learn more about the Navajo codes in the mentioned link:
brainly.com/question/12764347
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