Which topology is called the metric topology induced by d?

1
{B(x, Є|XЄx, Є > 0}
2
{Bd(x, ∈)|x ∈ X, ∈ > 0}
3
{(xd, ∈) | x, ∈ > 0}
4
{(xd, ∈) x, ∈ > 0}

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