GKFix MCQ Question

What is the total work to assemble the four charges in the square?

• A. \frac{q^2}{4\pi\epsilon_0 d}(2 - \frac{1}{\sqrt{2}})
• B. \frac{-q^2}{4\pi\epsilon_0 d}(2 - \frac{1}{\sqrt{2}})
• C. \frac{q^2}{4\pi\epsilon_0 d}(1 - \frac{2}{\sqrt{2}})
• D. \frac{-q^2}{4\pi\epsilon_0 d}(1 + \frac{1}{\sqrt{2}})