Electron shells 2 8 8 18

What is the correct arrangements of electrons in various shells, sub-shells and orbitals in an atom?

2, 8,18, 8, 32
2, 8, 8,18,18, 32
2, 8, 8, 8,18
2, 8,18, 32, 2

Option 2 : 2, 8, 8,18,18, 32