Summing ArrayList Elements

Consider the following Value class definition.

public class Value
{
    private int num;

    public int getNum()
    {
        return num;
    }
    // There may be instance variables, constructors, and methods not shown.
}

The getTotal method, shown below, appears in a class other than Value. It is intended to compute the sum of the num instance variables for all Value objects in its ArrayList parameter.

/** Precondition: valueList is not null */
public static int getTotal(ArrayList<Value> valueList)
{
    int total = 0;
    /* missing code */
    return total;
}

Which of the following code segments, when substituted for /* missing code */, will cause the getTotal method to work as intended?

I. 
for (int x = 0; x < valueList.size(); x++)
{
    total += valueList.get(x).getNum();
}

II. 
for (Value v : valueList)
{
    total += v.getNum();
}

III. 
for (Value v : valueList)
{
    total += getNum(v);
}