Electric field $\vec{E}$ at the surface of charged conductor is:

A. $|\vec{E}|=\frac{\sigma}{\varepsilon_0}$
B. $\vec{E}$ has a tangential component
C. Electric field is zero everywhere inside the conductor.
D. Any excess charge must reside on the surface of the conductor.

Choose the correct answer from the options given below:

A, C and D only

The correct answer is Option (4) → A, C and D only