Questions regarding 12 October quiz and contents of nested table (1505)

The 12 October quiz asked the following: Assuming that l_table is declared as you see below, which of these Boolean expressions are always true, regardless of the contents of the nested table?

DECLARE
  TYPE numbers_t IS TABLE OF NUMBER;
  l_table   numbers_t := numbers_t ();

Several people have written to me about this (actually, on a different blog post - I will copy them below for clarity) as follow: "I completely mis-read today's quiz for October 12th, and looking at the average score, I am assuming everyone else did too. I thought all the choices referred to an empty table/array, even though in retrospect you clearly say otherwise. Live and learn, I guess." "Yes, the quiz would be much more clear if a comment like /* some operations on the l_table here */ will be present in the block." And two players put together a block of code to demonstrate that the way I scored the answers was incorrect for the empty nested table shown in the question. I thought it was rather clear that since (a) I do not include the executable section and (b) I say "always true, regardless of the contents of the nested table" (italics added), I am asking you which statement will be true regardless of what you do with the nested table in the executable section. Not clear enough, I suppose. I am not going to change the score (uh oh, perhaps others will stop playing the Challenge? Hmmm. It is 5:45 AM. Perhaps I am just irritable). I will, however, change the text of the question so that it is more clear in the future (I say this because I plan in the future for you to be able to take quizzes again, to practice and further sharpen your knowledge!). Regards, SF