若有以下程序     #include      typedef  struct stu {                       char  name[10], gender;                       int  score;                      } STU;     void  f(STU  a, STUB)     {  b = a;        printf( "%s,%c,%d,", b.name, b.gender, b.score );     }     main()     {  STU  a={"Zhao", 'm', 290}, b={"Qian", 'f', 350};        f(a,b);        printf("%s,%c,%d", b.name, b.gender, b.score);     }则程序的输出结果是(    )
A、Qian,f,350,Qian,f,350
B、Zhao,m,290, Zhao,m,290
C、Zhao,m,290,Qian,f,350
D、Zhao,m,290,Zhao,f,350