According to the modern atomic model, what is the electron configuration of \(_{20}\ce{Ca}\) at the ground state?

**(A)**: \(1s^2 2s^2 2p^4 3s^2 3p^4 3d^6\)

**(B)**: \(1s^2 2s^2 2p^6 3s^2 3p^8\)

**(C)**: \(1s^2 2s^2 2p^6 3s^2 3p^8\)

**(D)**: \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\)

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