If \( \sqrt{\log _{4}\left\{\log _{3}\left\{\log _{2}\left(x^{2}-2 ... VIDEO
If \( \sqrt{\log _{4}\left\{\log _{3}\left\{\log _{2}\left(x^{2}-2 x+a\right)\right\}\right\}} \) is defined \( \forall x \in R \), then the set of values of 'a' is
\( \mathrm{P} \)
(A) \( [9, \infty) \)
(B) \( [10, \infty) \)
(C) \( [15, \infty) \)
(D) \( [2, \infty) \)
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