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Select the correct statement(s):
(a) The ionic crystal of \( \mathrm{AgBr} \) may have Schottky defect
(b) The unit cell having crystal parameters, \( a=b \neq c, \alpha=\beta=90^{\circ}, \gamma=120^{\circ} \) is hexagonal
(c) In ionic compounds having Frenkel defect the ratio \( r^{+} / r^{-} \)is high
(d) The co-ordination number of \( \mathrm{Na}^{+} \)ion in \( \mathrm{NaCl} \) is 6
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