Which of the Following Statements Regarding Arbitrage and Security Prices

Which of the following statements regarding arbitrage and security prices is INCORRECT?

A) The general formula for the no-arbitrage price of a security is Price(security) = PV(all cash flows paid by the security) .
B) When a bond is underpriced, the arbitrage strategy involves selling the bond and investing some of the proceeds.
C) We call the price of a security in a normal market the no-arbitrage price for the security.
D) In financial markets it is possible to sell a security you do not own by doing a short sale.