Which of the following statements declares the studentGrade variable?

Group of answer choices

enum studentGrade $\{$A$,$ B$,$ C$,$ D$,$ F$\}$;

enum int $\{$A$,$ B$,$ C$,$ D$,$ F$\}$ studentGrade;

enum studentGrade $\{$A$,$ B$,$ C$,$ D$,$ F$\}$ grades;

enum grades $\{$A$,$ B$,$ C$,$ D$,$ F$\}$ studentGrade;