What are the three bleed air sub-systems present in the aircraft?

The presence of the three bleed air sub-systems in the Dassault Falcon 2000LXS includes engine bleed, APU bleed, and ground air connector.

Engine bleed refers to the air extracted from the engine compressor, which is used for various systems, including environmental control and engine start. The APU (Auxiliary Power Unit) bleed system allows the aircraft to harness air from the APU, which provides power and bleed air when the main engines are not running. The ground air connector is designed to allow external ground air sources to supply pressurized air for systems while the aircraft is on the ground, particularly useful for pre-conditioning the cabin before flight.

These three systems work in concert to ensure that the aircraft has a reliable and efficient source of bleed air for various functions, including cabin pressurization, air conditioning, and engine starting. The other options do not accurately reflect the three distinct types of bleed air sub-systems found in the Falcon 2000LXS, as they include incorrect or non-existent systems.