Explanation: Inmarsat systems B, M4, and Fleet are designed to offer high-speed data capabilities at or above 64/54 kbps. **Inmarsat-B** was a precursor to modern broadband satellite services, offering global voice, fax, and data services, including ISDN-like data at 64 kbps. **Inmarsat-M4** refers to Global Area Network (GAN) services, which evolved from the Inmarsat-M standard to provide packet data and 64 kbps ISDN services, suitable for internet access and video conferencing. **Inmarsat Fleet** encompasses maritime services like FleetBroadband (based on BGAN technology) and Fleet Xpress. These systems provide IP data speeds significantly higher than 64/54 kbps (e.g., FleetBroadband offers up to 432 kbps), thereby inherently offering services at or above the 64/54 kbps data rate. In contrast, **Inmarsat-C** is a low-speed, store-and-forward messaging system, typically operating at 600 bps, used primarily for GMDSS and data reporting. **Mini-M** offered voice and data up to 2.4 kbps. Neither C nor Mini-M provide data speeds near 64/54 kbps.