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