Which of the following reaction is correct?

The product formed in the reaction,

Chlorination of ${\mathrm{CH}}_4$ involves the following steps:

$\left(\mathrm{i}\right) {\mathrm{Cl}}_2\underset{}{\stackrel{}{\to }2}\stackrel{•}{\mathrm{C}}\mathrm{l}$

$\left(\mathrm{ii}\right) {\mathrm{CH}}_{4 }+ \stackrel{•}{\mathrm{C}}\mathrm{l} \stackrel{}{\to \stackrel{•}{ \mathrm{C}}{\mathrm{H}}_{3 }} +\mathrm{HCl}$

$\left(\mathrm{iii}\right) \underset{ }{\overset{•}{{\mathrm{CH}}_3}}+\stackrel{}{\underset{ }{\overset{•}{\mathrm{Cl}}} \underset{}{\to }{\mathrm{CH}}_3\mathrm{Cl}}$

Which of the following is rate determining ?

Which of the following is correct potential energy diagram for the given chain propagating step?

Identify the major product.