Which of the following statements is $NOT$ true regarding a crystalline solid?
- AThere is a regularity and periodicity in the arrangement of constituent particles.
- BIt is isotropic.
- CIt melts at a definite temperature.
- DIt has different magnitudes for refractive index in every direction.
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Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
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Choose the most appropriate answer from the options given below.
Assertion $A$: Sharp glass edge becomes smooth on heating it up to its melting point.
Reason $R$: The viscosity of glass decreases on melting.
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