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A first-class lever is characterized by the arrangement of its components, where the fulcrum is positioned between the effort and the load. In this case, having the fulcrum located at one end of the lever accurately reflects the structure of a first-class lever.

This configuration allows for the effort and load to be on opposite sides of the fulcrum, making it possible to effectively lift or move the load by applying force on the opposite side. Examples of this type of lever include a seesaw or a pair of scissors, where the central pivot (fulcrum) allows for movement in both directions.

The other options describe different lever arrangements. When the effort and load are on the same side of the fulcrum, as stated in one option, it describes a different kind of lever, typically a second-class lever. In third-class levers, the effort is applied between the load and the fulcrum, which also does not fit the first-class configuration. Understanding these distinctions is crucial for recognizing how different lever systems operate in biomechanics and physics.