Pass few elements to methods

I've few methods which acept collections of fixed size (e.g. 2, 3, 5). And I can't decide which way is better:

public void Foo(IEnumerable<Object> objects)
{
    if(objects.Count() != 3)
    {
        throw new Exception()
    }
    // actions
}

public void Foo(Object objectA, Object objectB, Object objectC)
{
    // actions
}

Is there any ultimate +\- of each option?