<human>: What is the best way to: How can you get free Krispy Kreme donuts?

OPTIONS:
- The bottom of every receipt has a survey, if you fill out the survey you get a free donut, you can eat like this for a long time.
- The bottom of every receipt has a survey, if you fill out the survey you get a free napkin, you can eat like this for a long time.
<bot>: The bottom of every receipt has a survey, if you fill out the survey you get a free donut, you can eat like this for a long time.