Which of the Following Experimental Observations Were Used in the Study

Which of the following experimental observations were used in the study of Hatze (1981) to validate his model of the triceps brachii?

A) Stationary torque outputs at constant activation levels
B) Electromyograms at linearly increasing muscle lengths
C) Constant maximum isometric torques at various muscle lengths, quasi-stationary torque outputs at various activation levels, and linearly increasing torque outputs
D) Varying maximum isometric torques at constant muscle lengths