Given the following declarations, which are valid ways in C of declaring a new variable, mydog?

typedef struct dog $\{$

char $*$name;

$\}$ a$\_$dog;

typedef struct dog not$\_$a$\_$cat;

Group of answer choices

struct dog mydog;

a$\_$dog mydog;

not$\_$a$\_$cat mydog;

All of the above.

None of the above.