Hi,
Minor “issue”, not a big deal.
For the “What are properties?” question, when I reviewed what the answer was, there was only one answer possible out of the three choices. Questions expecting a single answer usually show radio buttons -- so why was this question showing checkboxes instead? All other single answer questions show (as expected) radio buttons for the answer to pick.
Again, not a big deal, but I think I was mislead in my answer with the checkboxes showing.