Two charged particles

The above shows isoelectric lines generated by two charged particles q1q_1 and q2q_2 fixed on the xx-axis of an xyxy-plane, where q1q_1 is a positively charged particle. The points A,A, BB and CC are also on the xx-axis with the distances from the origin being d,d, 3d3d and 5d,5d, respectively. The isoelectric line passing through the point BB is parallel to the yy-axis, and the point DD is on this isoelectric line. Which of the following statements is NOT correct?

a) q2q_2 is a negatively charged particle.

b) The voltage at the point AA is higher than the voltage at the point BB.

c) If we put a positive charge on the point BB, then it does not move.

d) The direction of the electric field at the point AA is the same as that at the point CC.

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