For the code snippet shown below, which of the following statements are valid?

public class TestAptitudeCrack
{
    public void TestSub<M> (M arg)
    {
        Console.Write(arg);
    }
}
class MyProgram
{
    static void Main(string[] args)
    {
        TestAptitudeCrack Aptitude = new TestAptitudeCrack();
        Aptitude.TestSub('AptitudeCrack ');
        Aptitude.TestSub(4.2f);
    }
}