Which characteristic is notable about INMARSAT-B regarding communication quality?

INMARSAT-B is designed to provide reliable voice, fax, and high-speed data services, which is one of its standout features. This system was created to ensure that users have consistent and high-quality communication capabilities even in remote or challenging environments, such as on ships or in areas without traditional telecommunications infrastructure.

The reliability of voice and fax services is particularly important for users who may need to communicate critical information over long distances or during emergencies. Additionally, the high-speed data functionality allows users to send and receive larger amounts of information quickly, which is essential in our increasingly connected world.

The other options suggest limitations or specific functionalities that do not accurately reflect the capabilities of INMARSAT-B. For example, while it is true that INMARSAT-B has sophisticated data capabilities, its functionality is not restricted to solely text-based communication, nor does it require perfect weather conditions to operate. This makes option C the most accurate characterization of INMARSAT-B in terms of communication quality.