Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified?

	A	B	C	D
1.	Subsidiary cell	Normal epidermal cell	Guard cell	Stomatal aperture
2.	Guard cell	Stomatal aperture	Subsidiary cell	Normal epidermal cell
3.	Normal epidermal cell	Guard cell	Stomatal aperture	Subsidiary cell
4.	Normal epidermal cell	Subsidiary cell	Stomatal aperture	Guard cell

 

• A

  1

• B

  2

• C

  3

• D

  4