Solve this :

8. A particle slides back and forth between two inclined frictionless planes as shown in Fig. Which of the following statements are correct with respect to the motion of particle ?

(i) The motion is oscillatory 
(ii) The motion is simple hannonic 
(iii) If h is the initial height,  $\mathrm{period}=\frac{4}{\sin \mathrm{\theta }}\sqrt{\frac{2\mathrm{h}}{\mathrm{g}}}$
(iv) If h is the initial height, $\mathrm{period}=\sqrt{\frac{2\mathrm{h}}{\mathrm{g}}}\sin \mathrm{\theta }$
(1) (i, iii)           (2) (i, iv) 
(3) (i, ii)            (4) (iii, iv)