Assuming sending a direct telex message to a shore-based office, which sequence of events best describes a complete ARQ telex exchange with a coast station?

Correct Answer: Option B — : Initiate call, observe phasing, wait for exchange of answer-backs (WRU-AAB), send DIRTLX command with zero, TELEX country code, TELEX number, send message, send KKKK to terminate the telex link, receive MRN and time and charges.

Standard ARQ procedures require initiating the call, achieving phasing, and completing the answerback exchange. To route a message to a land-based office, the operator must use the 'DIRTLX' command followed by the country code and subscriber number. The session concludes with 'KKKK' to terminate the link and receive the message reference number.