How Should The U.S. Respond To The Massive Sony Hack?

Hack back? Military strike? Sanctions? Nothing?

The U.S. is weighing a response to the devastating hack on Sony prompted by the movie The Interview starring Seth Rogen and James Franco.

The White House said Thursday that a "proportional response" would be needed, but didn't elaborate. Officials have also said North Korea was responsible for the hack.

So...