In the given diagram of the chemical structure of DNA, identify the type of bonding shown by A, B and C.  

• A

  A : N-glycosidic bonding; B : Phosphodiester bonding; C: Hydrogen bonding

• B

  A : N-glycosidic bonding; B : Covalent bonding; C : Phosphodiester bonding

• C

  A : Coordinate bonding;  B: Phosphodiester bonding; C : N-glycosidic bonding

• D

  A : N-glycosidic bonding; B : Hydrogen bonding; C : Phosphodiester bonding