Explanation: An Inmarsat Fleet Broadband IP handset is designed primarily for user interaction with the satellite terminal. Its main role is to provide a human interface for communication. Polling and Data Reporting (A) is a function typically performed by the Fleet Broadband terminal itself, often automatically or through machine-to-machine interfaces, to transmit status information, location data, or other pre-programmed reports. This is a feature of the satellite modem/terminal, not directly of the user's handset. Conversely, making Voice over IP telephone calls (B) is a primary function of an IP handset. Displaying terminal status (C), such as signal strength or connection status, is a common feature on any user interface for a communication device. Lastly, changing terminal parameters (D), like volume, ringtones, or initiating calls, are standard user-level adjustments accessible from the handset. The handset serves as the control and communication point for the user, while the terminal handles the automated reporting functions.