Which is the ground-state electron configuration of gas-phase Co2+? | Atomic Structure

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Which is the ground-state electron configuration of gas-phase Co²⁺?

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 4s₂ 3d₇

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 4s₂ 3d₅

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 4s₂ 4d₅

1s₂ 2s₂ 2p₆ 3s₂ 3p₆ 3d₇

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