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Write both the complete electron configuration and noble gas notation for the following.
Ar (Argon)
a. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
b. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰
c. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸
d. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹¹