The unit cell with parameters \( \alpha=\beta=\gamma=90^{\circ} \) and \( a=b \neq c \) is : (a)...

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The unit cell with parameters \( \alpha=\beta=\gamma=90^{\circ} \) and \( a=b \neq c \) is :
(a) cubic
(b) triclinic
(c) hexagonal
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