An amusement park charges an entrance fee of $20 and the rides cost $4 each. Suppose you write a function for the total cost of entering the park and riding any number of rides. What is the domain of the function based on the given context?

(1 point)
Responses

the set of whole numbers
the set of whole numbers

the set of positive integers
the set of positive integers

the set of real numbers greater than 20
the set of real numbers greater than 20

the set of non-negative real numbers