I believe the answer is: A, C, D
Option B is wrong because you are listening to the other person DURING the negotiation process, not before the negotiation process.
Option E is wrong because sharing full facts about your situation would make your negotiating opposition often a certain of power and influence during the negotiation process.
D is the answer Have a nice day
No we ban them for protection purposes so that ordinary scientists and citizens cant get their hands on them and use them against our own populous