A particle is constrained to move in the xy-plane under the influence of a conservative force. The potential energy of the particle as a function of position is given by \(U(x,y) = C(x^2 + 2y^2)\), where \(C\) is a positive constant. Which of the following vector diagrams best represents the direction and relative components of the net force \(\vec{F}\) exerted on the particle when it is at position \((x,y) = (d, d)\), where \(d > 0\)?