Charges +Q and -Q Are Arranged at the Corners of a Square

Charges +Q and -Q are arranged at the corners of a square as shown. When the electric field E and the electric potential V are determined at P, the center of the square, we find that

A) E ≠ 0 and V > 0.
B) E = 0 and V = 0.
C) E = 0 and V > 0.
D) E ≠ 0 and V < 0.
E) None of these is correct.