单选题 下列选项中，能实现对父类的getSalary方法重写的是______。
class Employee{
public Double getSalary(){};
}

• A.class Manager extends Employee{ public int getSalary(Double x){};}
• B.class Manager extends Employee{ public Double getSalary(int x,int y){};}
• C.class Manager extends Employee{ public Double getSalaryO{};}
• D.class Manager extends Employee{ public int getSalary(int x,int y){};}