three party transaction

A question from BSAS 2006 AM a client has a long term pflio it wishes to keep fully invested. the client thinks he has found a deeply undervalued stock he would like to invest in without selling his other shares. which is his least sensible option? A. Enter into a three party transaction. B. Enter into a loan with a bank to obtain cash and purchase the shares. C. Enter into a repurchase agreement, where a portion of his existing shares are loaned out in return for cash and interest. D. Go on margin with a broker, who Parks, Wilmer and Dodge will reimburse, with interest, upon the eventual sale of the new shares. What is three party transaction?

Looking at the choices, I think I would go with C --> because if he lending out a portion of his existing shares - he would no longer be fully invested in his current portfolio. CP