While no specific definition exists of this takeover defense developed by well-known New York attorney Martin Lipton, the book uses the example of Sotheby's that allow all shareholders except for the acquirer (Third Point) to buy shares of the company at half price once the bidder (acquirer) owned 20% of the company

aGolden Parachute

bGreenmail

cClassified Board

dPoison Pill

e none of the above