1. public class Blip { 
2. protected int blipvert（int x） { return 0； } 
3. } 
4. class Vert extends Blip { 
5. // insert code here 
6. } 
Which five methods， inserted independently at line 5， will compile？（）
 

1. public class Employee { 
2. String name； 
3. double baseSalary； 
4. Employee（String name， double baseSalary） { 
5. this.name = name； 
6. this.baseSalary = baseSalary； 
7. } 
8. } 
And： 
1. public class Salesperson extends Employee {
2. double commission； 
3. public Salesperson（String name， double baseSalary， 
4. double commission） { 
5. // insert code here 
6. }
7. } 
Which code， inserted at line 7， completes the Salesperson constructor？（）