Elevation in the boiling point for 1 molal solution of glucose is 2K. The depression in the freezing point for 2 molal solution of glucose in the same solvent is 2K. The relation between Kb and Kf is
(1) Kb = 0.5 Kf
(2) Kb = 2 Kf
(3) Kb = Kf
(4) Kb = 1.5 Kf