I have a quick question about option trading, if someone could answer it please. If I buy a call or a put for a stock/index at a particular strike price and leave it in place till the expiry, what happens if - for example, I bought a CALL option for a stock/index for a particular strike price (S.P.) and the stock/index closed above that? My call option would automatically be sold by the exchange/broker and amount credited to my account?