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17 June, 14:02

In this channel of communication, messages are carried by sound and light waves.

a. teleconference

b. face-to-face

c. voicemail

d. hard copy memos

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Answers (1)
  1. 17 June, 15:32
    0
    Teleconference always. Voicemail in the rare case where there is a modulated light segment somewhere in the path.
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