(1.25分)Mechanical advantage is described as the ratio of output force to the input force applied to a mechanism. How would a first-class lever be described?

A、The one where the load is placed in between the fulcrum and the effort.
B、The one where the effort is applied in between the fulcrum and the load.
C、The one where the fulcrum is placed in between the load and the effort.
D、None of the above