Which of the above methods are used to determine the polar mass moment of inertia of an engine flywheel with arms?

Question

Consider the following methods:

1. Trifiler suspension

2. Torsional oscillation

3. Fluctuation of energy of engine

4. Weight measurement & measurement of radius of flywheel

Which of the above methods are used to determine the polar mass moment of inertia of an engine flywheel with arms?                 

(a) 1 and 4                      (b) 2 and 3

(c) 1, 2 and 3              (d) 1, 2 and 4