SAN FRANCISCO AP – BusinessWeek magazine is the latest major publication facing an uncertain future amid a deep advertising slump that’s draining its main source of revenue.

McGraw-Hill Cos., BusinessWeek’s New York-based owner, sounded the alarm Monday by announcing it’s “exploring strategic options” for the 80-year-old magazine. The phrasing is often corporate code signaling a sale or some other significant shake-up is coming.