The military code-talking system refers to secret languages used for communication. Hence, option B is correct.
Code talkers deployed standardized, or impromptu codes centred on their native tongues to relay information via military telephone or radio communications networks. During World War II, the code talkers accelerated the encryption and decryption of communications in front-line operations.
The Navajo Nation was where the US Marines knew they could find one. The Navajo Code Talkers, a group of 29 Navajo men who developed a code based on the intricate, unwritten Navajo language, were chosen by the Marine Corps leadership.
Thus, option B is correct.
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