Which of the following is a correctly formatted Inmarsat-B address for sending communications to a shoreside TELEX terminal number 440122 in the United Kingdom (TELEX country code 51)?

Correct Answer: Option A — 51440122+

Inmarsat-B TELEX addressing requires the country code followed by the subscriber number, terminated by a plus sign (+) to signal the end of the dialing sequence to the Land Earth Station. This format ensures the network correctly routes the message to the specific international TELEX destination.