Assertion :A direct current flows through a metallic rod, producing magnetic field both inside and outside the rod.
Reason: There is no flow of charge carriers inside the rod.
a Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
b Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
c Assertion is correct but Reason is incorrect.
d Assertion is incorrect but Reason is correct.