Which of the following function satisfy Rolle's theorem?

1
f(x) = sinx, x [0, 2π] 
2
f(x) = |x|, x ∈ [-1, 1]
3
f(x) = |x - 1|, x ∈ [-2, 2]
4
\(f(x)=\frac{1}{x}, x \in[-1,1]\)

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