The electronic configuration of gadolinium (atomic no. 64) is [CBSE PMT 1997]

• A.                 \[[Xe]4{{s}^{8}}5{{d}^{9}}6{{s}^{2}}\]    
• B.                 \[[Xe]4{{s}^{7}}5{{d}^{1}}6{{s}^{2}}\]
• C.                 \[[Xe]4{{s}^{3}}5{{d}^{5}}6{{s}^{2}}\]    
• D.                 \[[Xe]4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}\]