Which of the following would indicate an Inmarsat-C terminal?

An Inmarsat-C terminal is identified by a specific numbering scheme that defines how the terminal's identifier is structured. The key aspect of this identification is that Inmarsat-C terminals utilize a mobile earth station number format that typically features a nine-digit number that adheres to certain prefixes and structure rules.

The correct identification in this case, which ends in '275', signifies compliance with the Inmarsat-C designation. The digits in the mobile earth station number reflect a standardized way to categorize and recognize terminals operating within the Inmarsat-C network.

While other options also consist of numeric sequences, they do not fit the established Inmarsat-C identification criteria, which requires a specific significant format and typically does not exceed nine digits. The correct choice conforms fully to the necessary characteristics of an Inmarsat-C terminal, validating its use in maritime communication for distress and routine messaging, allowing vessels to stay connected while at sea.