What is the objective of the Calisthenics exercises?

I- The acquisition of strength.
II- The beauty in the execution of the exercise.
III- The improvement of body movement coordination.
IV- The development of aerobic capacity.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only I, II, and III are correct.
d) I, II, III, and IV are correct.