Electric charge is transferred to an irregular metallic disk as shown in figure. If $\sigma_1, \sigma_2, \sigma_3$ and $\sigma_4$ are charge densities at given points then, choose the correct answer from the options given below:

A. $\sigma_1>\sigma_3 ; \sigma_2=\sigma_4$
B. $\sigma_1>\sigma_2 ; \sigma_3>\sigma_4$
C. $\sigma_1>\sigma_3>\sigma_2=\sigma_4$
D. $\sigma_1<\sigma_3<\sigma_2=\sigma_4$
E. $\sigma_1=\sigma_2=\sigma_3=\sigma_4$