Which is the value of this expression when a = negative 2 and b = negative 3? (StartFraction 3 a Superscript negative 3 Baseline b squared Over 2 a Superscript negative 1 Baseline b Superscript 0 Baseline EndFraction) squared StartFraction 4 Over 9 EndFraction StartFraction 27 Over 8 EndFraction StartFraction 243 Over 32 EndFraction StartFraction 729 Over 64 EndFraction