What did the bipartisan task force known as the Iraq Study Group conclude?
a) Iraq should be divided into semi-independent states governed by Kurds, Sunnis, and Shiites by 2008.
b) Once Iraq was stable, the United States should invade Iran to install a democratic government.
c) The United States should cut its losses by leaving Iraq immediately in 2006.
d) The United States should send a "surge" of tens of thousands more troops to Iraq in the fall of 2008.
e) U.S. combat troops should be withdrawn from Iraq by the spring of 2008.