What are the Kₐ₁ and Kₐ₂ of H₂SO₃ reacting with NaOH?

a) Kₐ₁ = 1 × 10⁻², Kₐ₂ = 1 × 10⁻⁷
b) Kₐ₁ = 1 × 10⁻⁴, Kₐ₂ = 1 × 10⁻⁸
c) Kₐ₁ = 1 × 10⁻³, Kₐ₂ = 1 × 10⁻⁶
d) Kₐ₁ = 1 × 10⁻⁵, Kₐ₂ = 1 × 10⁻⁹