Which constructor is the proper no$-$argument constructor for the Employee class below?

public class Employee

$\{$

private double mySalary;

$//...$

$\}$

Which constructor is the proper no$-$argument constructor for the Employee class below?

public class Employee

$\{$

private double mySalary;

$//...$

$\}$

private Employee$()$

$\{$

mySalary $=10000$;

$\}$

public Employee$()$

$\{$

double mySalary $=10000$;

$\}$

public Employee$($double salary$)$

$\{$

mySalary $=$ salary;

$\}$

public Employee$()$

$\{$

mySalary $=10000$;

$\}$