In the figure given, PQ is a long uniform coil of metal wire, V is a constant voltage source and ASB is a rheostat. Consider the following statements and choose the correct option.

I) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is North.

II) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is South.

III) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is North

IV) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is South.

(a) Only III and IV are correct 

(b) Only I and II are correct

(c) Only II and IV are correct 

(d) Only II and Iv are correct