A hair salon charges a fixed rate of $25.00 for a haircut and an additional $15 for any other services. Write a function to model the cost of services at the salon and then evaluate the function to determine the cost for a haircut, shampoo, highlight, and blow dry.
A) f(x) = 15x + 25; f(3) = 70
B) f(x) = 15x + 25; f(1) = 40
C) f(x) = 25x + 15; f(3) = 90
D) f(x) = 25x + 15; f(1) = 40