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If \( a, b \in \mathbf{R} \) and \( a^{2}-4 b \geq 0 \), the equation \( z^{4}+a z^{2}+b=0 \) has
Column 1
Column 2
(a) four real roots if
(p) \( a=0, b=0 \)
(b) two real and two
(q) \( a0, b0 \) imaginary roots if
(c) four imaginary roots if
(r) \( a \leq 0, b \geq 0 \)
(d) four equal roots
(s) \( a \leq 0 \)
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