1. What is a data structure? 2. Can two elements of the same array be of different data types? 3. The two methods of array access are called and 4. How many elements does array m have? Show how you would reference each one. double m[2][3]; 5. Consider this enumerated type definition: typedef enum {frosh, soph, jr, sr} class_t; What is the value of each of the following? a. (int)sr b. (class_t) c. (class_t) ((int)soph + 1) What is displayed by this code fragment? for (class - frosh; class