New York Post: Yahoo is quietly hiring advisers that specialize in defense against cage-rattling shareholders, even as it responds to investor demands that it put itself up for sale. The struggling web portal has begun approaching prospective bidders for its core business, and interested parties include Verizon, AT&T and Comcast. But at the same time, Yahoo’s board has tapped Innisfree M&A — a proxy advisory firm that specializes in recruiting investor support in board contests — as it girds for a possible battle with Starboard Value.