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

The sequence ARQ (Automatic Repeat reQuest), FEC (Forward Error Correction), and SFEC (Selective Forward Error Correction) corresponds to different types of communication methods and their respective characteristics. The correct choice highlights their roles effectively.

ARQ is used in two-way communications where the receiver can request retransmission of lost or corrupted data. This process involves a feedback mechanism that allows for error correction through communication in both directions.

FEC represents a method of correcting errors where additional data is sent along with the original transmission, allowing the receiver to identify and correct errors without needing retransmission. This method typically applies to one-way communications since the correction happens without feedback from the receiver.

SFEC, which selectively corrects certain types of errors in the received data, also pertains to one-way communications. It builds on the principles of FEC but provides more targeted corrections.

Understanding this, the correct answer reflects that ARQ is intended for two-way communication, while both FEC and SFEC pertain to one-way communications to all stations, which allows the communication pattern to match the given sequence accurately.