Which one of the following is correct?
选项：

A:char *a="china"; is equivalent to char *a; *a="china" ;;
B:char str[10]={"china"}; is equivalent to char str[10]; str[]={"china";};
C:char *s="china"; is equivalent to char *s; s="china" ;;
D:char c[4]="abc",d[4]="abc"; is equivalent to char c[4]=d[4]="abc" ;