Which of the following methods has led to the most discoveries of massive planets orbiting near their parent stars? a) detecting the starlight reflected off the planetb) detecting the infrared light emitted by the planetc) detecting the gravitational effect of an orbiting planet by looking for the doppler shifts in the star's spectrumd) detecting the shift of the star's position against the sky due to the planet's gravitational pulle) detecting a planet ejected from a binary star system