A business analyst uses a function, Q, to analyze vending machines revenue. Q(n) represents the revenue from the machine, where n is the number of quarters machine received over a specified time period. which of the following would be a possible domain?
{0.25,0.50,0.75,1.00,...}
{-2,-1,0,1,2}
{...-2,-1,0,1,2,...}
{0,1,2,3,...}