The set of values of \( k \) for which \( x^{2}-k x+\sin ^{-1}(\sin 4)0 \) for all real \( x \) ...

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The set of values of \( k \) for which \( x^{2}-k x+\sin ^{-1}(\sin 4)0 \) for all real \( x \) is
(a) \( \phi \)
(b) \( (-2,2) \)
(c) \( \mathrm{R} \)
(d) none of these
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