Which of the following complex compound (s) is/are paramagnetic and low spin?(I) \[{{K}_{3}}\left[ Fe\left( C{{N}_{6}} \right) \right]\] (II) \[{{\left[ Ni{{\left( CO \right)}_{4}} \right]}^{10}}\](III) \[{{\left[ Cr{{(N{{H}_{3}})}_{6}} \right]}^{3+}}\] (IV) \[{{\left[ Mn\,(C{{N}_{6}}) \right]}^{4\,-}}\]Choose the correct code:

• A. I only                           
• B. II and III
• C. I and IV            
• D. IV only