Suppose I define some structure type ( studentInfo), then I declare an instance of it and I decide to also create a pointer to the instance like so:

typedef struct{

int age;
char idNum[9];
}
studentInfo;

...Code continues...

struct studentInfo mainInfo, *pMain;
pMain = &mainInfo;

Which of the following options is functionally equivalent to:

a. (p*Main).age = 20;
b. *pMain. age = 20;
c. pMain. age = 20;
d. *(pMain. age) = 20;