What is the correct electron configuration for chromium, considering its exception?

• A. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²
• B. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s¹
• C. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
• D. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²

Answer: (C)