Which address format is correct for sending TELEX to an Inmarsat-B terminal located in the AOR-E?

In the context of sending a TELEX message to an Inmarsat-B terminal, the correct address format uses a specific prefix that identifies the type of service and the satellite's Area of Responsibility (AOR). For Inmarsat-B terminals in the AOR-E, the correct prefix is "870" which indicates that the message is being routed through the Inmarsat network.

The answer identified is correct because it begins with the "870" prefix, followed by a numerical string that typically represents the individual terminal's identification number. This ensures that the message is correctly routed through the Inmarsat system to the intended terminal.

Other formats provided do not have the appropriate prefix for Inmarsat-B services or do not conform to the expected numbering scheme for this system. They either lack the essential "870" identifier or follow incorrect variations, which would prevent the TELEX from reaching the desired terminal or being recognized by the Inmarsat network.