A caterer has 5 rolls. He is ordering more rolls. He can order up to 9 packages of rolls and each package contains 12 rolls. The caterer cannot order partial packages. The function that models the number of rolls the caterer has is f(p)=12p+5f(p)=12p+5, where p is the number of packages the he orders.
What is the practical domain of the function?
A: all real numbers from 1 to 9, inclusive
B: {17, 29, 41, 53, 65, 77, 89, 101, 113}{17, 29, 41, 53, 65, 77, 89, 101, 113}
C: all integers from 1 to 9, inclusive
D: all real numbers
