Given a struct variable named student and a member variable GPA of type double, which of the following statements initializes GPA to $0\mathrm{.}0?$

a$.$ GPA.student $=0\mathrm{.}0$;

b$.$ student.GPA$(0\mathrm{.}0)$;

c$.$ student.GPA $=0\mathrm{.}0$;

d$.$ student$($GPA$)=0\mathrm{.}0$;