33. Which of the following statements concerning the advantages of Fourier transform infrared spectroscopy (FT-IR)?
(i) High signal-to-noise ratio due to the multiplex (Fellgett) advantage.
 (ii) FT-IR provides higher spectral resolution solely by using narrower slits.
(iii) High wavenumber accuracy provided by an internal laser reference.
(iv) Photomultiplier tube detectors are commonly used in FT-IR spectroscopy.
(v) A sodium chloride window is commonly used in FT-IR spectroscopy
(A) (i), (iii), (v)
(B) (i), (ii), (iii)
(C) (ii), (iv)
(D) (i), (iv), (v)
(E) (iii), (iv)