Six point charges

Six point charges are kept at the vertices of a regular hexagon of side $L$ and centre $0$ , as shown in the figure. Given that $K= \frac{1}{4\pi\epsilon_0} \frac{q}{L^2}$ , which of the following statement(s) is(are) correct?

(A) The electric field at $0$ is $6K$ along $OD$ .
(B) The potential at $0$ is zero.
(C) The potential at all points on the line $PR$ is same.
(D) The potential at all points on the line $ST$ is same.