You can easily find out this for youself by using google.If you can write on Quora it means that you have either a computer,a tablet or a smart phone .That means that you can get a comprehensive answer to your question yourself.You can also pick any brokerage and click into their investment requirements or request their investment brohure and,wallah! you have their requirements at your fingertips. You see they are not standard to the many online brokers. Some parts are but there are variation based on many factors. One example is whether you are an international investor or a domestic investor. happy research.