A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
Correct answer: (a) 1 only
Explanation
Statement 1 is correct as phonons represent quantum mechanical lattice vibrations transporting thermal energy. Statement 2 is incorrect because the material exhibits ultra-low lattice thermal conductivity driven by an unusual wave-like heat transport phenomenon, not high thermal conductivity.
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