Why can we purify plasmid DNA by chromatography column in the kit (试剂盒)? A.
A. The chromatography column can bind protein. B.
B. The chromatography column can bind protein, RNA and DNA.       C.
C. The chromatography column can specifically bind DNA under high salt environment. D.
D. The chromatography column can specifically bind DNA under H2O environment. E.
E. All of the above.