From an Inmarsat-C terminal which of the following is a correctly formatted address for sending TELEX messages to a vessel in AOR-W?

Correct Answer: Option D — Either a) or c) are correct, depending on the Inmarsat system addressed.

Inmarsat-C addressing varies based on the specific network and service provider. Both 58-series and 87-series codes are utilized depending on the ocean region and the specific LES configuration. Consequently, the correct format depends entirely on the technical requirements of the system being addressed for the AOR-W region.