Hi, I have some questions about QQQQ option. Basically, the purpose I want to buy some QQQQ puts is to prevent some stock market crash like 1987, loss 20% in one day. Because I am using margin at about 1.5, so if that happens, the really bad thing will be I lost 30%. But I don't know what kind of option is good for me to choose. I am thinking buy QQQQ put expiring two months later and the $2 more in price. For example, on Feb 1, I will buy March QQQQ. If the current price is $44, I will buy $46 put. What do you think if I am doing the right thing? And I am also confuse the two ticker name, what's the difference between QQQOT and UQQOT for example. Thank you.