What's wrong is that the question has been misunderstood. This is a quantification problem, which in principle could be cured by using symbolic logic instead of English. But in a case like this, something deeper is wrong. Grounding in the context saves the student from most verbal pitfalls. One goal of teaching is to ground the student in the context.
Linguistic ambiguities can hurt.
All are exclusive. A student can accept that logicians felt they had to pick one or the other. Perhaps they had a reason for picking the inclusive. Peter Lax tells about the famous logician Abraham Fraenkel, of German origin and Israeli residence. Once in Jerusalem or Tel Aviv he was on a bus scheduled to leave the station at 9A.m.