Hydrofluoric acid is a weak acid. At 25°C, the molar conductivity of 0.002 M HF is 176.2 Ω-1 cm2 mol-1 If its Amo = 405.2 Ω-1 mol-1. Equilibrium constant at the given concentration is
(a) 6.7 x 10-4 M
(b) 3.2 x 10-4 M
(c) 6.7 x 10-5 M
(d) 3.2 x 10-5 M