The correct statements among the following are

The probability density $$\psi^2$$ for a hydrogen atom is zero at $$r = 0$$

In an atom, orbitals with the same quantum number have different energies

The energy of a given orbital with same principal quantum number decreases as the atomic number Z increases

For a given atomic number, the configuration having the maximum number of parallel spins is of the lowest energy than any other arrangement arising from the same configuration