Pick up the correct statement from the following:
(A) For determination of small colour intensities, tintometer is generally used
(B) The odour of water sample is generally measured by a term called odour intensity
(C) The colour of water sample may be detected by Nessler tube
(D) All the above
(A) For determination of small colour intensities, tintometer is generally used
(B) The odour of water sample is generally measured by a term called odour intensity
(C) The colour of water sample may be detected by Nessler tube
(D) All the above