Which shows the following etion a cubed b Superscript negative 2 Baseline Over a b Superscript negative 4 Baseline EndFraction, a noxpression after the negative exponents have been eliminated? StartFract-equals 0, b not-equals 0 StartFraction a cubed b Superscript negative 4 Baseline Over a b Superscript negative 2 Baseline EndFraction StartFraction a b Superscript 4 Baseline Over a cubed b squared EndFraction Negative StartFraction a cubed b Superscript 4 Baseline Over a b squared EndFraction StartFraction a cubed b Superscript 4 Baseline a b squared EndFraction