Which equation correctly relates magnetic permeability **µ**, vacuum permeability **µ₀**, and relative permeability **µᵣ**?
**µ** = **µ₀** + **µᵣ**
**µ** = **µ₀** / **µᵣ**
**µ** = **µ₀** * **µᵣ**
**µ** = **µ₀** - **µᵣ**

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