Which of the following statements is/are correct for Kf ?I. Kf depends upon the nature of solvent.Il. Kf is known as freezing point depression constant / molal depression constant.lll. Kf is known as cryoscopic constant.    Select the correct conclusion derived from the equation.

The proportionality constant K f depends on the nature of solvent and is known as freezing point depression constant or molal depression constant or cryoscopic constant. Unit of Kf is K kg mol−1.                M2=Kf×w2×1000ΔTf×w1where w2 gram of solute having molar mass as M2 is present in w1 gram of solvent.