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Consider the function \( \mathrm{f}(\mathrm{x})=\left\{\begin{array}{ll}x^{2}-1, & -1 \leq x \leq 1 \\ \ln x, & 1x \leq e\end{array}\right. \)
P
Let \( \quad \mathrm{f}_{1}(\mathrm{x})=\mathrm{f}(\mathrm{x} \mid) \)
\[
\begin{array}{l}
f_{2}(x)=|f(x)| \\
f_{3}(x)=f(-x)
\end{array}
\]
Now answer the following questions.
Number of positive solution of the equation \( 2 \mathrm{f}_{2}(\mathrm{x})-1=0 \) is (are)
(a) 4
(b) 3
(c) 2
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