Still new to options.. If you have a vertical bull call spread, if by expiration the stock price is higher than the higher strike price, I know that's the point where you reach your maximum profit potential. I'm assuming this is done by exercising the option and selling it back to the buyer of the short call for profit. How is this done using thinkorswim? Does thinkorswim execute all of that for you upon expiration automatically? Also what happens if someone wants to exercise the call you are selling them prior to expiration?