I agree with everyone else that the correct (or most likely) answer of one isn't on the list. ANything over 2 is definitely overfeeding. I never feed mine more than once and usually have one day a week that I don't feed them.
I personally, feed my fish twice a day. In the morning, and at night. If they are fry, I feed like 5-6 times a day. The only reason I feed as much as I do, is because I do weekly gravel Vac's to keep nitrates down to an acceptable level. The food also helps keep the fish in breeding condition.