Returning two lists in C#

Question

I have been researching this for a while now, and am still unsure on how to implement and what is the best way to return two lists from a separate method?

I know the

Answer 1

Method 1

public static void Method2(int[] array, out List list1, out List list2, int number)
{
    list1= new List();
    list2= new List();
    ...
}

Method 2

public static Tuple, List> Method2(int[] array, int number)
{
    list1= new List();
    list2= new List();
    ...

    return Tuple.Create(list1, list2)
}

Method 3

Create a class that have 2 props list1, list 2, return that class, or just return array of lists

and finally on C# 7 you can just do

public static (List list1, List list2) Method2(int[] array, int number)
{
    ...
    return (list1, list2)
}