Four objects, each carrying a charge of magnitude \(q\), are placed at the corners of a square measuring \(d\) on each side. Two of the objects are positively charged, and two are negatively charged, with like-charged objects placed at opposite corners of the square.

(a) Is the electric potential energy associated with this charge distribution positive, negative, or zero?

(b) Confirm your answer to part \(a\) by calculating the electric potential energy.