Gmdss : Element 7 - 520/600
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| Which of the following statements concerning SITOR communications is true? |
| A) ARQ transmissions are made in data groups consisting of three-character blocks. |
| B) ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message. |
| C) ARQ communications rely upon error correction by time diversity transmission and reception. |
| D) Forward error correction is an interactive mode. |
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