Which expressions show the prime factorization of 90? Check all that apply.

Factor 90: 90 = 9 × 10 = 3 × 3 × 2 × 5. Thus its prime factorization is 2 × 3² × 5, shown by choice C, or equivalently 2 × 3 × 3 × 5, shown by choice E. The other choices either include a composite factor or do not multiply to 90.

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