What Are the Three Fundamental Conditions of an Effective Stretch-Shorten

What are the three fundamental conditions of an effective stretch-shorten cycle (in order) ?

A) First, a short and fast eccentric phase; second, a well timed preactivation of the muscles before the eccentric phase; third, an immediate transition between eccentric and concentric phases.
B) First, a well timed preactivation of the muscles before the eccentric phase; second, a short and fast eccentric phase; third, an immediate transition between eccentric and concentric phases.
C) First, a short and fast eccentric phase; second, an immediate transition between eccentric and concentric phases; third, a well timed preactivation of the muscles before the eccentric phase.
D) First, an immediate transition between eccentric and concentric phases; second, a short and fast eccentric phase; third, a well timed preactivation of the muscles before the eccentric phase.