Identify A and B from the diagram given below.

 

	A	B
1.	Vegetative cell	Mucilagenous sheath
2.	Mucilagenous sheath	Vegetative cell
3.	Heterocyst	Mucilagenous sheath
4.	Mucilagenous sheath	Heterocyst

• A

  1

• B

  2

• C

  3

• D

  4