如果结构变量s中的生日是“1984年11月11日“,下列对其生日的正确赋值是()。struct student{int no; char name[20]; char sex;struct{int year; int month; int day;}birth;}s;
A. year = 1984; month = 11; day = 11;
B. birth.year = 1984; birth.month = 11; birth.day = 11;
C. s.year =1984; s,month = 11; s.day = 11;
D. s.birth.year = 1984; s.birth.month = 11; s.birth.day = 11;