Let \( f(x)=\sqrt{1+x^{2}}, x\sqrt{3} \) \[ \sqrt{3} x-1, \sqrt{3} \leq x4 \] \( [x], 4 \leq x5 ...

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Let \( f(x)=\sqrt{1+x^{2}}, x\sqrt{3} \)
\[
\sqrt{3} x-1, \sqrt{3} \leq x4
\]
\( [x], 4 \leq x5 \), where \( [x] \) is the greatest integer \( \leq x \) \( |1-x|, x \geq 5 \)
The number of points of discontinuity of \( f(x) \) in \( R \) is
(a) 3
(b) 0
(c) infinite
(d) none of these
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