A.
struct student {int sno; char name[20]; float score ;} stu[100];
B.
struct student stu[100] {int sno; char name[20]; float score};
C.
struct { int sno; char name[20]; float score;} stu[100];
D.
struct student {int sno; char name[20]; float score; }; struct student stu[100];