For which functions would the appropriate domain be all positive integers? A) The function f(n) models the size of a jar that holds n marbles. B) The function f(y) models the number of inches a tree grows in n years. C) The function f(c) models the circumference a balloon based on radius, r. D) The function f(s) models the population of mice based on the number of n snakes in an ecosystem. E) The function f(n) models the amount of labor-hours it takes to construct n televisions that are ready to be sold.