Assertion: In frekel defect in an ionic crystal, an ion is dispalced from its normal site to an interstitial site.
Reason: There is both a vacancy and an intersitial ion.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true bur reason is false
D. If assertion is false bur reason is true