Concept:The SpaDex mission is an acronym for Space Docking Experiment, focusing on the technology that connects two spacecraft in orbit.Explanation:SpaDex aims to demonstrate and test autonomous space docking systems. Space docking involves joining two spacecraft while they are moving in orbit. This requires precise guidance, navigation, and control. The experiment will trial advanced sensors and algorithms to achieve a safe, automated link-up. Successful docking is vital for assembling large structures, transferring crew or cargo, and supporting deep-space missions. It reduces reliance on manual control and enables future space station operations, satellite servicing, and interplanetary travel. The mission builds on techniques used in the International Space Station, Apollo-Soyuz, and SpaceX Crew Dragon.Answer:B. Space docking