\(x^4+(1-2k)x^2+k^2-1=0\), where \(k\) is **real**. If \(x^2\) is imaginary, or \(x^2<0\), the equation has **no real roots**.If \(x^2>0\), the equation has **real roots**

The equation has no real roots if \(k\in\)

\(A)\)- \((-\infty,-1)\)

\(B)\)- \((-1,1)\)

\(C)\)- \((1,\frac{5}{4})\)

\(D)\)- \((\frac{5}{4},\infty)\)

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