Which choice is not a valid type definition of a structure that contains x and y coordinates as integers, and that can be used exactly as shown for the variable named center?

coord center;
center.x = 5;
center.y = 3;

• A
  typedef struct coord {
  int x;
  int y;
  };
• B
  typedef struct coord {
  int x;
  int y;
  } coord;
• C
  typedef struct {
  int x;
  int y;
  } coord;
• D
  struct coord {
  int x;
  int y;
  };
  typedef struct coord coord;