Create an equivalent expression for 1.2 cubed over 1.3 raised to the fourth power all raised to the power of negative seven.

1.2 to the twenty first power over 1.3 to the twenty eighth power
1.3 to the twenty-eighth power over 1.2 to the twenty first power
1.2 raised to the fourth power over 1.3 cubed
1.3 cubed over 1.2 raised to the fourth power