The TRI can be quite complex. As such, I have decided to present the fool-proof principles behind the categorization for my readers.
Category 1- The leaflets you see stuck on/slipped under your door/gate. You do not want them.
Category 2- A mint offered to you by your friend. You won't reject, but you won't go to the shop to get some.
Category 3- If you have an itch, you'd scratch it-pro-activeness.
Category 4- Good lord Jesus Christ is all I have to say (and what you would say).
Shoot, score, smile.