The important thing is to get the exam bit right! The F70/100 has literally, matchstick size stall strips close to the root of the wing. Their job:- To trip the air into buffet and thus help stall the root before tip. Stall warning comes from the stall vanes (AoA jobbies), the output of which is fed into a little black box. The buffet is also a bit of a give away, but it's not easy getting to the buffet without turning a few things off. However, if exam feedback says that this doesn't happen, then it doesn't. Since when have exams reflected real life?