Historical Trivia: What Was the Reason Given by the Nazis for Kreystalnacht?

It's something which tends to fall out of the debate: especially if you are one of those people who think that Arming the Jews might have prevented the Holocaust.  So, the question is:
What was a reason given by the Nazis for Kreystalnacht?

1. They didn't need a reason--they just hated the Jews.
2. They were waiting for the right time to persecute Jews this way
3. The Murder of a German diplomat in Paris by a Jewish person in protest of the Nazi treatment of the Jews.
4. All of the Above

Part of me is interested in seeing your responses, which I probably won't read.  In fact, I have already posted the answer, which  I've set to post tomorrow.