Explanation: SITOR (SImplex Teletype Over Radio) FEC (Forward Error Correction) is a broadcast mode where information is transmitted one-way from a sending station to multiple receiving stations. This mode incorporates error correction by transmitting redundant information (often by sending each character twice) so that receiving stations can correct errors without needing to send an acknowledgment. Therefore, **D) Two-way communication with the coast radio station using FEC is not necessary to be able to receive the** (implying "receive the broadcast" or "receive the information") is true. You simply tune in and decode the signal; no return path or acknowledgment is required. Let's look at why the other options are incorrect: * **A) Communication is established on the working channel and answerbacks are exchanged before FEC.** Answerbacks are characteristic of two-way ARQ (Automatic Repeat reQuest) mode, not one-way FEC broadcast. * **B) In the ARQ mode each character is transmitted twice.** This describes FEC mode. ARQ uses a request/retransmission protocol for error correction, not simple double transmission of every character. * **C) Weather broadcasts cannot be made in FEC because sending each character twice would cause the...** This is incorrect. Weather broadcasts are *commonly* made using SITOR FEC precisely because the redundant transmission (like sending each character twice) enhances reliability for one-way broadcasts without requiring a return channel.