Two point charges, \(+Q\) and \(-Q\), are fixed on the \(x\)-axis at positions \(x = -d\) and \(x = +d\), respectively. A small positive test charge \(+q\) is placed on the positive \(y\)-axis at position \((0, y)\). Which of the following qualitative graphs best describes the magnitude of the net electric force \(F\) exerted on the test charge as a function of its position \(y\) for \(y \ge 0\)?