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Which one of the following statements is correct?

i. Magnetic field is a quantity that has both magnitude and direction.

ii. The magnetic field inside a long straight solenoid carrying current is the same at all points.

iii. The magnetic field lines inside a solenoid carrying current are concentric circles.

iv. It was the Oersted who discovered the magnetic effect of current.

v. If a soft iron rod is placed inside a current carrying solenoid, the strength of magnetic field becomes zero.

A) i and iii

B) i, iii and iv

C) i, ii and iv

D)  i, iii, iv and v

E)  None of these