The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?

Correct Answer: Option C — Two way communications, one-way communications to all stations, one-way communications to a single station.

ARQ (Automatic Repeat Request) provides two-way, error-corrected communication between two stations. FEC (Forward Error Correction) is a broadcast mode for all stations. SFEC (Selective FEC) is a broadcast mode addressed to a specific station, allowing one-way communication without the receiver needing to transmit back to the sender.