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If \( f(x)=\left\{\begin{aligned} x^{2}, & \text { for } x \geq 0 \\ x, & \text { for } x0\end{aligned}\right. \), then \( f o f(x) \) is given by
a) \( x^{2} \) for \( x \geq 0, x \) for \( x0 \)
b) \( x^{4} \) for \( x \geq 0, x^{2} \) for \( x0 \)
c) \( x^{4} \) for \( x \geq 0,-x^{2} \) for \( x0 \)
d) \( x^{4} \) for \( x \geq 0, x \) for \( x0 \)
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