Which of the following is an essential condition for effective combination of atomic orbitals?

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Which of the following is an essential condition for effective combination of atomic orbitals?

1. Atomic orbitals should have almost same energies2. Extent of overlap between the atomic orbitals should be large3. The combining atomic orbitals should have the same symmetry about the molecular axis4. All are correct

Which of the following is an essential condition for effective combination of atomic orbitals?