Mark the correct alternative in each of the following: If \( x \) is real and \( k=\frac{x^{2}-x...
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0Mark the correct alternative in each of the following:
If \( x \) is real and \( k=\frac{x^{2}-x+1}{x^{2}+x+1} \), then
(A) \( k \in[1 / 3,3] \)
(B) \( k \geq 3 \)
(C) \( k \leq 1 / 3 \)
(D) none of these
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