In which of the following functions would it be appropriate to use only positive integers for the domain? Select all that apply.

1.The function c(p) represents the cost for (p) people to attend the movies.
2.The function m(t) represents the miles driven over t hours.
3.The function t(m) represents the average high temperature for a given number of months.
4.The function p(w) represents the profit of a farmer who sells (w) whole watermelons.
5.The function h(n) represents the number of person-hours it takes to assemble (n) engines in a factory.