Observe the following statements:

Question

I. Bleching powder is used in the preparation of chloroform.

II. Bleaching powder decomposes in the presence of $CoCL_2$ to liberate $O_2$

III. Aqueous $KHF_2$  is used in the preparation of fluorine.

The correct combiantion is :

(a) I,II and III are correct

(b) Only II is correct

(c) Only I and III are correct

(d) Only I and II are correct