Assertion: Standard optical diffraction gratings cannot be used for discriminating between X-ray wavelengths. Reason: The grating spacing is not of the order of X-ray wavelengths.
a. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
b. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
c. Assertion is true, but the reason is false.
d. Assertion is false, but the reason is true.
