Which of the following is/are bio fertiliser used to add, conserve and stimulate phosphorus as a plant nutrient in the soil?1. Azospirillum2. Mycorhizal fungi3. AzotobacterSelect the correct answer using the codes given below.

Which of the following is/are bio fertiliser used to add, conserve and

1.	Which of the following is/are bio fertiliser used to add, conserve and stimulate phosphorus as a plant nutrient in the soil?1. Azospirillum2. Mycorhizal fungi3. AzotobacterSelect the correct answer using the codes given below.
A.	Only 1 and 2
B.	Only 1
C.	Only 2
D.	All 1, 2 and 3
Answer» E.