A movie theater is offering a special summer pass. Passholders pay \( \$ 8 \) per movie for the first \( 5 \) movies and watch additional movies for free, up to a maximum of \( 15 \) movies. The function C gives the total cost, in dollars, for a passholder to watch \( n \) movies.
Q. Is function C a piecewise function? Explain your reasoning.