Messages are transmitted by an Inmarsat LES according to what criteria?

The correct approach for message transmission by an Inmarsat Land Earth Station (LES) is based on priority. This means that messages are handled according to their assigned priority levels, ensuring that urgent or important communications are transmitted first, regardless of when they were received. This prioritization is crucial in situations where time-sensitive information needs to reach recipients promptly, such as in emergency situations or critical operational communications at sea.

In contrast, the other methods listed do not accurately reflect how Inmarsat LES manages message transmission. For example, First In, First Out (FIFO) and Last In, First Out (LIFO) concepts focus on the order of arrival and processing without prioritizing based on content urgency or relevance. Meanwhile, using a serial number for transmission management does not inherently imply that messages will be sent based on urgency or importance; instead, it refers to the unique identification of each message. Prioritization ensures that the most critical messages are given the attention they require in a timely manner.