Which of the Following Statements Are True of Genes

Which of the following statements are true of genes?
1)Genes usually exist in multiple variant forms.
2)Genes consist of intervening, noncoding DNA sequences.
3)Genes consist of intervening, coding sequences.
4)Only 1% of the human genome is noncoding DNA that is used to make mRNAs and proteins.

A)1, 2, 3, 4
B)1, 2, 3
C)1, 3, 4
D)2, 3, 4

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