In terms of communication capabilities, what does INMARSAT-M offer?

INMARSAT-M is a satellite communication service that provides a robust range of capabilities, which include voice, data, fax, and e-mail services. This versatility makes it suitable for various applications, particularly in maritime and remote areas where traditional communication infrastructures may be lacking.

The service supports standard communication needs for users who require both voice calls and data transmission, allowing for comprehensive connectivity. With the ability to transmit faxes and handle e-mail, INMARSAT-M caters to business and operational requirements that depend on reliable long-distance communications.

Other options mentioned in the question do not encompass the full capabilities of the INMARSAT-M system. For instance, while option A suggests high-speed data transmission, it overlooks voice and other data capabilities. Similarly, option C, which claims exclusively voice communication, fails to recognize the data transmission and other services included. Finally, option D, indicating limited text messaging services, is also inadequate as it does not reflect the more extensive functionality of voice, fax, and e-mail that INMARSAT-M provides. Therefore, the correct answer highlights the comprehensive communication services available through this system.