How should the U.S. government respond to the Sony attack?

President Obama told the White House Press Corps that Sony was wrong to withdraw its film, “The Interview,” and that the U.S. would react “proportionally” to the damaging cyber-attack by North Korea. Judy Woodruff turns to Dmitri Alperovitch of CrowdStrike and Jack Pritchard, the former U.S. special envoy for negotiations with North Korea, about options for an American response.