A vessel is operating in the Western Atlantic. To initiate a ship-to-shore telephone contact to a shoreside party in the U.S.A, number 123-456-7890, through the Southbury Earth Station, using automatic service, a valid Inmarsat dialing sequence is?

Correct Answer: Option C — 001# 0011234567890#

Inmarsat automatic dialing requires the CES access code followed by the country code and subscriber number. For Southbury (access code 001), the sequence 001# initiates the call, followed by the country code 1 and the full 10-digit telephone number, terminated by the # key to signal the end of input.