The following compounds can be classified as $N,N$-dimethylpropan$-1-$amine,$N$-methylaniline,and aniline,respectively. Identify their classification as primary,secondary,or tertiary amines.

• A
  Primary,secondary,tertiary
• B
  Primary,tertiary,secondary
• C
  Secondary,tertiary,primary
• D
  Tertiary,secondary,primary