Select the statement that correctly describes the roles of histone and nonhistone proteins found in chromatin?

A)Only histones have a structural role in chromatin.
B)Only nonhistone proteins have a structural role in chromatin.
C)Histone proteins function primarily in chromosome segregation.
D)Both histone and nonhistone proteins have a structural role in chromatin.
E)Nonhistone proteins function only in replication and chromosome segregation.