A local theater sells admission tickets for $9.00 on Thursday nights. At capacity, the theater holds 100 customers. The function M(n)=9n represents the amount of money the theater takes in on Thursday nights, where n is the number of customers. What is the domain of M(n) in this context? A
All non-negative integers that are multiples of 9

B
All non-negative integers less than or equal to 900

C
All whole numbers

D
All non-negative integers less than or equal to 100