The set of values of \( c \) for which the angle between the vector...

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The set of values of \( c \) for which the angle between the vectors \( c x \hat{i}-6 \hat{j}+3 \hat{k} \& x \hat{i}-2 \hat{j}+2 c x \hat{k} \) is
(W) acute for every \( x \in R \) is
(A) \( (0,4 / 3) \)
(B) \( [0,4 / 3] \)
(C) \( (11 / 9,4 / 3) \)
(D) \( [0,4 / 3) \)
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