Which of the following is correct about the assembly of chromosome: A: nucleosome→core histone octamer→solenoid→microstrip→loop domain→chromatid B: core histone octamer→nucleosome→solenoid→loop domain→microstrip→chromatid C: core histone octamer→nucleosome→microstrip→solenoid→loop domain→chromatid D: core histone octamer→nucleosome→solenoid→microstrip→loop domain→chromatid