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# The microelement required for the synthesis of IAA is represented in its ionic form as a cofactor in this enzyme :

$\begin {array} {1 1} (1)\;Catalase & \quad (2)\;PEP\: carboxy\: kinase \\ (3)\;Carbonic\: anhydrase & \quad (4)\;Nitrogenase \end {array}$

Can you answer this question?