\[ f(x)=\left\{\begin{array}{ll} \frac{\sqrt{1+p x}-\sqrt{1-p x}}{x...

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\[
f(x)=\left\{\begin{array}{ll}
\frac{\sqrt{1+p x}-\sqrt{1-p x}}{x}, & -1 \leq x0 \\
\frac{2 x+1}{x-2}, & 0 \leq x \leq 1
\end{array}\right.
\]
is continuous in the interval \( [-1,1] \), then \( \mathrm{p} \) is equal to
(a) \( -1 \)
(b) \( -1 / 2 \)
(c) \( 1 / 2 \)
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