What is the ground state electron configuration of a 27Co atom in the gas phase? | Atomic Structure

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Question

What is the ground state electron configuration of a ²⁷Co atom in the gas phase?

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₇

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₉

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₈ 4s₁

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₇ 4s₂

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