can someone explain this to me please? > The YCombinator company probably didn't care enough to have their lawyer draw up the paperwork so that their employee

can someone explain this to me please? > The YCombinator company probably didn't care enough to have their lawyer draw up the paperwork so that their employees can execute on their stock options from the first day to avoid AMT. what does "executing" on stock options mean? how does it work with vesting?