How is a signal radiated from an Inmarsat-B system's antenna?

Correct Answer: Option A — It is a highly focused directional signal that must be beamed at the desired satellite.

Inmarsat-B terminals utilize high-gain, stabilized parabolic antennas to maintain a narrow, focused beam directed precisely at the geostationary satellite. This directional capability is necessary to achieve the high data rates required for voice, fax, and high-speed data transmission, necessitating continuous tracking of the satellite's position.