Why Is the Etchant or Conditioner Applied on the Occlusal Surface

Why is the etchant or conditioner applied on the occlusal surface 2 to 3 mm beyond the area to be sealed?

A) To prevent fracture of the sealant and possible microleakage.
B) To ensure coverage of the tooth.
C) To make room for buffing after the sealant process.
D) Because there is shrinkage of the material after application.