For a current in a long straight solenoid N-and S-poles are created at two the ends. Among the following statements the incorrect statement is:

Options

A. The field lines inside the solenoid are in the form of stright lines which indicats that the magnetic field is the same at all points inside the solenoid.
B. The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron,when placed inside the coil
C. The pattern of the magnetic field associated with the solenoid si different from the pattern of the magnetif field around a bar magnet.
D. the N and S poles exchange position whne the direction of current through the solenoid is reversed.