Java Object Reference Parameters

Consider the following Date class.

public class Date
{
    private int day;
    private int month;
    private int year;
    public Date()
    {
        ...
    }
    // default constructor
    public Date(int mo, int da, int yr)
    {
        ...
    }
    public int month() // returns month of Date
    {
        ...
    }
    public int day() // returns day of Date
    {
        ...
    }
    public int year() // returns year of Date
    {
        ...
    }
    // Returns String representation of Date as "m/d/y", e.g., 4/18/1985.
    public String toString()
    {
        ...
    }
}

The Date class is modified to include the following mutator method.

public void addYears(int n) // add n years to date

Now consider the following client code.

public static void addCentury(Date recent, Date old)
{
    old.addYears(100);
    recent = old;
}

public static void main(String[] args)
{
    Date oldDate = new Date(1, 13, 1900);
    Date recentDate = null;
    addCentury(recentDate, oldDate);
    ...
}

Which of the following statements is true after the call to addCentury in the main method completes?