Given the following class and array declaration, how would you print out the age of the 10th person in the array?

class personClass
{
public:
void setAge(int newAge);
void setGender( char newGender);
void setSalary(float newSalary);

int getAge();
char getGender();
float getSalary();
private:
int age;
char gender;
float salary;
};

personClass people[100];

a. cout << people[10];
b. cout << people[9];
c. cout << people[9].age;
d. cout << people[9].getAge();

d. cout << people[9].getAge();