Exception Handling - General Questions

What is the output of the following program?

try { Console.Write("A"); }
finally { Console.Write("B"); }

What is the output of the following program?

string? s = null;
try { Console.Write(s!.Length); }
catch (NullReferenceException) { Console.Write("null"); }

Which block always executes, whether or not an exception occurs?

Which property of an exception shows the chain of method calls where it occurred?

What is the output of the following program?

Console.WriteLine(Check(-1));
static string Check(int v)
{
    try { if (v < 0) throw new ArgumentException(); return "ok"; }
    catch (ArgumentException) { return "neg"; }
}