You are exploring options with a strike price of $420 on a stock that is currently trading for $400. The risk-free rate is 3% and the options you are considering are for a 3-month horizon.

For a European Call option, the premium must be at least ___ and no more than ___.

For an American Call option, the premium must be at least ___ and no more than ___.

For a European Put option, the premium must be at least ___ and no more than ___.

For an American Put option, the premium must be at least ____ and no more than____.