Which of the following options are CORRECT about a non conducting, thin circular disk of radius R and uniform surface charge density $\sigma$ . (assume electrostatic potential at infinity to be zero)

electrostatic potential near centre of disk is  $\frac{\sigma R}{2{\epsilon }_0}$

electrostatic potential near the periphery of disk is  $\frac{\sigma R}{\pi {\epsilon }_0}$

electrostatic self energy of the disk is  $\frac{2{\sigma }^2{R}^3}{3{\epsilon }_0}$

electrostatic self energy of the disk is  $\frac{{\sigma }^2{R}^3}{4\pi {\epsilon }_0}$