Three semi-infinite rods uniformly charged out of which one is negatively charged and other two are positively charged are kept perpendicular to plane of paper outward such that the finite ends of the rods are located at points A, B and C on a circle of radius R as shown in figure. The net electric field at centre of circle O is :

Options

A. `(2Klambda)/(R)`, along OC
B. `(Klambda)/(R)`, perpendicular to plane of paper and inward direction
C. `(sqrt5Klambda)/(R)` at an angle `tan^(-1).(1)/(2)` with OC
D. `(sqrt2Klambda)/(R)` at an angle `45^(@)` with OC