What is the sequence of the energy of the orbitals 3s, 3p and 3d for `He^(+)`ion ?

What is the sequence of energies of 3s, 3p and 3d-orbitals in (i) a hydrogen atom, and (ii) a multielectron atom?

The decreasing order of energy of the 3d,4s,3p,3s orbital is :-

The decreasing order of energy of the 3d,4s,3p,3s orbital is :-

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

Which has higher energy 3d or 4s orbital why?

The energy of the second Bohr orbit in the hydrogen atom is -3.41eV. The energy of the second Bohr orbit of He^(+) ion would be :

The energy of the second Bohr orbit in the hydrogen atom is -3.41eV. The energy of the second Bohr orbit of He^(+) ion would be :