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Which could be the first step in simplifying this expression? Check all that apply.
(x cubed x Superscript negative 6 Baseline) squared

A: (x Superscript negative 18 Baseline) squared
B: (x Superscript negative 3 Baseline) squared
C: (x Superscript negative 2 Baseline) squared
D: x Superscript 6 Baseline x Superscript negative 12 Baseline
E: x Superscript 5 Baseline x Superscript negative 4