Let \( A=\{x \mid-1 x\}=B \). If \( f: A-» B \) be bijective then a...

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Let \( A=\{x \mid-1 x\}=B \). If \( f: A-» B \) be bijective then a possible definition of \( f(x) \) is
\( \mathrm{P} \)
(a) \( |x| \)
(b) \( x|x| \)
(c) \( \sin \pi x \)
(d) none of these
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