| Column $I$ | Column $II$ |
|---|---|
| $(A)$ $f(x) = x|x|$ | $(p)$ continuous in $(-1, 1)$ |
| $(B)$ $f(x) = \sqrt{|x|}$ | $(q)$ differentiable in $(-1, 1)$ |
| $(C)$ $f(x) = x + [x]$ | $(r)$ strictly increasing in $(-1, 1)$ |
| $(D)$ $f(x) = |x - 1| + |x + 1|$ | $(s)$ not differentiable at least at one point in $(-1, 1)$ |
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