Which excerpt from "code talkers” best illustrates that the navajo code talkers were quick-thinking and precise?

(a)the code was comprised of two components. first, navajo words were chosen to represent specific, frequently used military terms for which there was no direct equivalent in the navajo language.
(b)during the famous battle of iwo jima, six navajo code talkers operated continuously, transmitting each message without a single mistake.
(c)the code talkers’ work has also been recognized in popular culture. the movie windtalkers and the novel code talker both offer fictional accounts of the code talkers’ experiences.
(d)although american indian soldiers had effectively used their languages to create and transmit secret messages during world war i, military leaders were reluctant to use the code a second time, fearing that it would no longer be effective.