Which of these best characterizes nonverbal elements in intercultural communication?

a. Nonverbal signals are universal, so they overcome the limitations of language.

b. Nonverbal signals are unique to each culture, so they are of no help in intercultural communication.

c. The meaning of certain nonverbal signals can differ from one culture to the next, so never assume you can use the same signals you use in your own culture.

d. Nonverbal signals should always be worked out in advance so that the two parties in an exchange are sure of their meaning.