Consider the equation \( x^{4}-i x^{2}+9=0 \). This can be solved b...

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Consider the equation \( x^{4}-i x^{2}+9=0 \). This can be solved by substituting \( x^{2}=t \) such equations are called as pseudo quadratic equations.
If the equation has only two real roots, then set of values of \( \lambda \) is
(A) \( (-\infty,-6) \)
(B) \( (-6,6) \)
(C) \( \{6\} \)
(D) \( \phi \)
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