Which of the following describes the types of levers?

The classification of levers is based on the relative positions of the effort, load, and fulcrum. In the case of levers, there are three distinct types:

1. First-class levers have the fulcrum located between the effort and the load. A common example is a seesaw, where the pivot is in the middle, and effort and load are at either end.

2. Second-class levers have the load positioned between the fulcrum and the effort. An example of this type is a wheelbarrow, where the wheel acts as the fulcrum, the load is in the center, and the effort is applied at the handles.

3. Third-class levers have the effort applied between the fulcrum and the load. A common example is using a pair of tweezers or a fishing rod, where the effort is applied closer to the fulcrum, making it easier to lift the load.

Thus, the correct response accurately identifies the three categories of levers based on their configurations, providing a basis for understanding their mechanical advantages and applications in various physical tasks. Other categorizations mentioned do not pertain to the traditional lever types.