<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.q: wakati wa tukio la timu, ni nini kinatokea wakati washiriki wa timu wanashindwa kufuata mahitaji ya kiwango cha chini cha kiwango cha ziada yaani. wakati wa mashindano?  <response>: q: what happens to an option when the expiration date closes with the underlying stock trading exactly at the strike price at the money? 