Which is a free living nitrogen fixing bacteria

Options :
  1. Anabaena
  2. Bacillus polymyxa
  3. Rhizobium
  4. all the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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I waited patiently for the Lord and He inclined unto me and He heard my cry. He lifted me out of the horrible pit, out of the miry clay,and He has set my feet upon a ROCK and He established my steps, and He has given me a a new song even praise unto our God many shall see it and fear and shall trust in the Lord...the first lines of an ancient Hebrew song Psalm 40: -
-King David