Which of the following best defines a Small Unmanned Aircraft System (sUAS)?

A Small Unmanned Aircraft System (sUAS) is best defined as a remotely controlled small aircraft. This term encompasses both the aircraft itself and the associated equipment, including the remote control mechanism and any necessary software. sUAS are typically used in various applications like aerial photography, agriculture, surveying, and more, without a pilot onboard the aircraft.

The definition highlights that an sUAS operates under remote control, distinguishing it from full-sized, piloted aircraft which are not classified as unmanned systems. The other options do not appropriately represent the characteristics of a sUAS; they refer to manned aircraft, space systems, or traditional piloted helicopters, which do not fit the definition of being "unmanned" or being small in size relative to commercial aviation standards.