A thick, spherical conducting shell centered at the origin \(O\) has inner radius \(a\) and outer radius \(b\) and carries a net charge \(+Q\). Inside the cavity, a point charge \(+q\) is held fixed at position \((d, 0, 0)\), where \(0 < d < a\), and the entire system is in electrostatic equilibrium. Point \(P_{\text{cond}}\) is located within the conducting material at \((0, \frac{a+b}{2}, 0)\), point \(P_1\) is located outside the shell at \((2b, 0, 0)\), and point \(P_2\) is located outside the shell at \((-2b, 0, 0)\). Which of the following correctly compares the electric field magnitudes at these three points and characterizes the equipotential boundaries of the system?