Which equation explains Nitrification? 1. \[N{{H}_{3}}\to N{{O}_{2}}\to N{{O}_{{{3}^{\,-}}}}\] 2. \[N{{H}_{3}}\to N{{O}_{3}}\to N{{O}_{{{2}^{\,-}}}}\] 3. \[N{{H}_{3}}\to N{{O}_{3}}\to N{{O}_{{{2}^{\,-}}}}\] Select the correct answer from the following codes

• A. 1 only              
• B. 2 only
• C.  3 only             
• D. All of the Above