🔍 Key Concepts

• ARQ (Automatic Repeat reQuest) communications procedures used in maritime telex/telecommunication systems • Specific command formats used to initiate a direct TELEX call to shore versus those used during an ongoing conversation • Meaning and typical use of control prompts like GA (Go Ahead) and basic keys like ENTER in telex-style systems

💭 Think About

• Look at which option actually resembles a calling command string that could include routing or station information, rather than normal text within a message • Ask yourself: which characters or sequence would likely be used before a conversation starts, to set up the link, rather than during message exchange? • Consider which of these options would be used specifically to reach a particular shore-based telex number, and which are just generic message or procedural signals

✅ Before You Answer

• Identify which choice contains what could be a destination telex number or address rather than normal text • Distinguish between procedural signals (like GA) and command/format strings used to set up a call • Verify which option is actually associated with starting a direct telex call in ARQ mode, not just sending or ending regular text