Which equation justifies why nine to the one-third power equals the cube root of

Which equation justifies why nine to the one-third power equals the cube root of nine?

nine to the one-third power all raised to the third power equals nine raised to the one-third times three power equals nine

nine to the one-third power all raised to the third power equals nine raised to the one third plus three power equals nine

nine to the one-third power all raised to the third power equals nine raised to the one third minus three power equals nine

nine to the one-third power all raised to the third power equals nine raised to the three minus one-third power equals nine