a1littledahanyakids a1littledahanyakids

26-07-2016
Physics

Answered

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

Ateleconference
Bface-to-face
Cvoicemail
Dhard copy memos

Verified Answer :

26-07-2016

Teleconference always. Voicemail in the rare case where there is a modulated light segment somewhere in the path.

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