Engineering Mathematics Set Theory & Algebra Relations

Which one of the following function f : R → R is injective?

1
f(x) = |x|, x ∈ R
2
f(x) = -x, x ∈ R
3
f(x) = x2, x ∈ R
4
f(x) = c, x ∈ R
5
Not Attempted

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