The correct answer is C. cyber-physical system.
A cyber-physical system (CPS) is an embedded system that meshes the computing process with the physical world in the form of an interactive as well as intelligent system. CPSs are used in a variety of applications, including transportation, healthcare, manufacturing, and energy.
A cloud-physical system is a system that combines the capabilities of the cloud with the capabilities of the physical world. Cloud-physical systems are used in a variety of applications, including disaster recovery, data backup, and real-time analytics.
A cyber-space system is a system that is used to control and monitor the physical world. Cyber-space systems are used in a variety of applications, including air traffic control, power grid management, and military command and control.
None of the above is a correct answer.