Monochromatic X-rays of wavelength \(\lambda\) are incident at a glancing angle \(\theta\) on parallel atomic planes of a crystal separated by distance \(d\). First-order constructive interference is observed at this angle. The crystal is then replaced by a second crystal with lattice plane spacing \(d' = \dfrac{4}{3}d\), and X-rays of wavelength \(\lambda' = \dfrac{2}{3}\lambda\) are used. Which of the following expressions correctly relates the sine of the new glancing angle, \(\sin\theta'\), for the first-order maximum to \(\sin\theta\)?