Which number is appropriate for an Inmarsat-B terminal placing a TELEX call via Southbury to another ship logged-in to the AOR-E?

The appropriate number for an Inmarsat-B terminal placing a TELEX call via Southbury to another ship logged in to the AOR-E is derived from the structure and requirements for dialing such calls.

When placing a TELEX call through an Inmarsat-B system, there are specific prefixes that correspond to the communication region and the system being used. In this scenario, the correct answer includes the appropriate international access code, which is '001' that signifies the international dialing format, followed by the '0058' code that is meant for ships and indicates calling through the Inmarsat service.

Furthermore, there’s a distinction based on the 'AOR-E' which corresponds to the Atlantic Ocean Region-East for Inmarsat services. This region requires the designated dialing format, including the ship's unique identifier after the initial codes.

The numbers that follow after the initial segments reflect valid TELEX numbers that are registered and operational within this particular network setup. The combination of '0058' along with the specific identifier leads to the correct construction of a valid call number format through the Inmarsat system, ensuring compatibility and successful connection to the vessel being called.

Thus, the structure of the number in the selected choice aligns perfectly with the requirements of