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？（） 

public class Car { 
private int wheelCount； 
private String vin； 
public Car（String vin） { 
this.vin = vin； 
this.wheelCount = 4； 
} 
public String drive（） { 
return “zoom-zoom”； 
} 
public String getInfo（） { 
return “VIN： “+ vin + “wheels： “+ wheelCount； 
} 
} 
And： 
public class MeGo extends Car { 
public MeGo（String vin） { 
this.wheelCount = 3； 
} 
} 
What two must the programmer do to correct the compilation errors？（）