Let F(x) Compute the Cost of a Rental Car After $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = 96$

Multiple Choice

Let f(x) compute the cost of a rental car after x days of use at $45 per day. What is the interpretation of the solution of $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = 96$ ?

A) The cost of rental for 96 days
B) The cost of rental for 45 days
C) The number of days rented for $96
D) The number of days rented for $45