Which of the following statements about $TLC$ are correct?
$(i)$ Glycine is identified on $TLC$ plate due to its colour.
$(ii)$ Amino acids can be detected by spraying the $TLC$ plate with $Ninhydrin$ solution.
$(iii)$ The retardation factor $(R_f)$ is the ratio of the distance travelled by the solute to that of the solvent from the base line.
$(iv)$ Sodium chloride is commonly used as an adsorbent.

• A
  $(ii)$, $(iii)$
• B
  $(i)$, $(ii)$, $(iii)$
• C
  $(ii)$, $(iii)$, $(iv)$
• D
  $(i)$, $(iii)$