Identify the structures marked $A$ to $F$ in the given diagram

• A

  $A-Asymmetric nucleus, \;B-Nucleus, \;C-Generative cell, \;DVegetative cell, \;E-Pollen, \;F-Pollen tetrad$

• B

  $A- Pollen tetrad,\; B- Pollen, \;C-Generative cell, \;D-Vegetative cell, \;E-Asymmetric spindle, \;F-Nucleus$

• C

  $A-Pollen tetrad, \;B-Vacuole,\; C-Nucleus, \;D-Asymmetric spindle, \;EVegetative cell, \;F-Generative cell$

• D

  $A-Vacuole, \;B-Nucleus, \;C-Pollen tetrad, \;D-Vegetative cell, \;E-Asymmetric spindle, \;F- Generative cell$