Given the following class, what would be the best declaration for a mutator function that allows the user of the class to change the age?
class Wine
{
public:
Wine();
int getAge();
float getCost();
private:
int age;
float cost;
}
a. int getAge(int newAge);
b. Wine();
c. void setAge();
d. void setAge(int newAge);
d. void setAge(int newAge);
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