Which of the following are examples of the prohibited practice of manipulation in the securities markets?
I. Broker-Dealer Joker is unhappy with its investment in the stock of a speculative firm and engages another broker-dealer to purchase a large number of shares from it, with the unofficial agreement to buy back those shares, offer more shares which the second broker-dealer will purchase, and so on.
II. Broker-Dealer Joker has a large short position in the stock of a certain corporation. Joker offers a bonus to its agents who effect sale transactions in the stock.
III. A client calls Broker-Dealer Joker with a request to purchase 20 bonds issued by Massachusetts Institute of Technology (MIT.) The bonds are currently selling for their par value of $1,000. Knowing this, Joker offers to sells the client the bonds for $120 per $100 of par, or $1,200 per $1,000 bond.