Which  of the following Statements  are correct?

a) Micelle formation by soap in aqueous solution is possible at all temperatures.

b) Micelle formation by soap in aqueous solution occurs above a particular concentration.

c) On dilution of soap solution, micelles may revert to individual ions.

d) Soap solution behaves as a normal strong electrolyte at all concentrations. 

Micelle formation: some substances at low concentration behave as a normal electrolytes but higher concentration exhibit colloidal behavior due to the formation of micelles. CMC (Critical Micelle Concentration): the concentration above which Micelle formation takes place as a micelle known as critical micelle concentration (CMC)Eg.., soap solution in aqueous above particular concentration (called $\text{CMC}={10}^{-4}-{10}^3{\text{\hspace{0.17em}mol\hspace{0.17em}\hspace{0.17em}L}}^{\text{-1}}$) forms soap micelles.On dilution soap solution behaves as a normal electrolyte and after adding excess of water intermolecular force of attraction between the soap particles decreases and soap solution micelles may revert to individual ions.