I am new to option trading. I would like to know:
For US options, what is the time frame for the underlying stock to be delivered once the call/put is exercised?
If sell a call and I am unable to deliver the stock when exercised, what will happen?
If I sell a bearish call spread with a short call at strike price $A and a long call at the higher strike price $B then if the stock price rise above $B, what happens if the stock rises above $B and the call at $A is exercised and I exercise the call to buy the stock at $B?
How do I deliver the stock I obtained at $B to the holder of the call at $A?