Let f : [0, 1] → ℝ be a function. Which one of the following is a sufficient condition for f to be Lebesgue measurable?

1
|f| is a Lebesgue measurable function
2
There exist continuous functions g, h : [0, 1] → ℝ such that g ≤ f ≤ h on [0, 1]
3
f is continuous almost everywhere on [0, 1] 
4
For each c ∈ ℝ, the set {x ∈ [0, 1] : f(x) = c} is Lebesgue measurable

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