Exception Handling - General Questions

What is the output of the following program?

try { int.Parse("abc"); }
catch (FormatException) { Console.Write("format"); }

What does an exception filter (catch (Exception e) when (cond)) do?

What is the output of the following program?

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

What is the output of the following program?

try
{
    int[] a = new int[2];
    a[5] = 1;
}
catch (IndexOutOfRangeException) { Console.Write("index"); }
catch (Exception) { Console.Write("other"); }

What is the output of the following program?

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