Select the correct statements about three dimensional HCP system. (...

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Select the correct statements about three dimensional HCP system.
(A) Number of atoms in HCP unit cell is six.
(B) The volume of HCP unit cell is \( 24 \sqrt{2} r^{3} \).
\( \mathrm{P} \)
(C) The empty space in HCP unit cell is \( 26 \% \).
(D) The base area of HCP unit cell is \( 6 \sqrt{3} r^{2} \).
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