Teaching NVS PGT 2024 Test Series Mathematics Relations and Functions

Which one of the following functions is one-one?

1
f : R → R given by f(x) = 2x2 + 1 for all x ∈ R
2
g : Z → Z given by g(x) = x4 for all x ∈ Z
3
h : R → R given h(x) = x3 + 4 for all x ∈ R
4
ϕ : C → C given by ϕ(z) = z3 + 4 for all z ∈ C
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