When engaging in voice communications via an Inmarsat-B terminal, what procedures are used?

Correct Answer: Option B — CODECs are used to digitize the voice signal.

Inmarsat-B voice communications rely on digital transmission techniques to maximize bandwidth efficiency. CODECs (Coder-Decoder) are employed to digitize analog voice signals into compressed data streams, which are then transmitted over the satellite link and reconstructed into audible voice at the receiving terminal, ensuring clear, reliable communication.