Consider the following statements: The use of interpoles in dc machines is to counteract the

   I. Reactance voltage
II. Demagnetizing effect of armature mmf in the commutating zone
III. Cross-magnetizing effect of armature mmf in the commutating zone
Which of these statement(s) is/are correct?

A)     1 &2

B)      2&3

C)      1&3

D)     3 alone