What is a class of rotorcraft that carries an external load?

The correct answer refers to a classification of rotorcraft specifically known for their ability to carry external loads. This classification is significant because it encompasses rotorcraft designed and constructed to transport goods or equipment suspended beneath them, distinguishing them from other types of aircraft that typically transport loads within the fuselage.

Rotorcraft that are categorized within this class have specialized features such as external hook systems and enhanced stability controls for dealing with the dynamics introduced by carrying suspended loads. These characteristics make them ideal for applications like aerial construction, firefighting, and heavy lifting.

Other classes, while they may pertain to rotorcraft and their capabilities, do not emphasize the external load-carrying aspect specific to this classification. Thus, understanding the unique attributes associated with this class not only clarifies its function but also highlights its importance within the broader field of rotorcraft operations.