What does A, B and C represent in the given figure of a chromosome ?
A. `{:(" A"," B"," C"),("Centriole","Satellite","Primary constriction"):}`
B. `{:(" A"," B"," C"),("Centriole","Satellite","Secondary constriction"):}`
C. `{:(" A"," B"," C"),("Centrometre","Satellite","Secondary constriction"):}`
D. `{:(" A"," B"," C"),("Centrometre","Satellite","Primary constriction"):}`