Which is the simplified form of the expression (startfraction (2 superscript negative 3 baseline) (x superscript negative 3 baseline) (y squared) over (4 superscript negative 2 baseline) (x superscript 4 baseline) (y superscript 6 baseline) endfraction) squared? startfraction 1 over 4 x squared y superscript 16 baseline endfraction startfraction 4 over x squared y superscript 16 baseline endfraction startfraction 1 over 4 x superscript 14 y superscript 8 baseline endfraction startfraction 4 over x superscript 14 baseline y superscript 8 baseline endfraction