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Buying & Selling Call Options
You're correct. If you have no option position at execution then you carry no risk. Your risk is only based on the net number of options you're holding at execution. This is handled by your broker or clearinghouse. Pretend that you wrote 1000 options, (you're short the call) then you bought 1000 of the same option (bought to cover) ... you are now flat and have zero options exposure. Pretend you bought 1000 options (you're long the calls) then you sold 1000 of them (liquidated your long) ... you are now flat and have zero options exposure.