$f$ is defined in $[-5,5]$ as $f(x)=\left\{\begin{array}{l}x, ext { if } x ext { is rational } \

Question

$f$ is defined in $[-5,5]$ as $f(x)=\left\{\begin{array}{l}x, 	ext { if } x 	ext { is rational } \ -x, 	ext { if } x 	ext { is irrational }\end{array}ight.$ Then

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(b)\