Four polaroids are placed such that the optic axis of each is inclined at an angle of $30^{\circ}$ with the optic axis of the preceding one. If unpolarised light of intensity $I_0$ falls on the first polaroid,the intensity of light transmitted from the fourth polaroid is $[\cos 30^{\circ} = \sqrt{3} / 2]$.

• A
  $\frac{9 I_0}{32}$
• B
  $\frac{27 I_0}{128}$
• C
  $\frac{35 I_0}{128}$
• D
  $\frac{27 I_0}{32}$