Which of the following is the correct electronic configuration of Nickel with an atomic number 28?

Q. Which of the following is the correct electronic configuration of Nickel with an atomic number 28?

A.            1s2 2s2 2p4 3s2 3p8 3d10

B.            1s2 2s2 2p6 3s2 3p6 3d10

C.            1s2 2s2 2p4 3s2 3p6 3d10 4s2

D.            1s2 2s2 2p6 3s2 3p6 3d8 4s2

Answer: 1s2 2s2 2p6 3s2 3p6 3d8 4s2