For \( a \in[\pi, 2 \pi] \) and \( n \in I \), the critical points of \( f(x)=\frac{1}{3} \) \( ...

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For \( a \in[\pi, 2 \pi] \) and \( n \in I \), the critical points of \( f(x)=\frac{1}{3} \) \( \sin a \tan ^{3} x+(\sin a-1) \tan x+\sqrt{\frac{a-2}{8-a}} \) is
(a) \( x=2 n \pi \)
(b) \( x=2 n \pi \)
(c) \( x=(2 n+1) \pi \)
(d) no critical points
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