This pseudocode should determine and output the rental fees for cars. Standard cars rent for $65 per day, compacts rent for $40 per day, and subcompacts rent for $30 per day. Rentals for at least 7 days receive a 20% discount. An error message is displayed if the car type is not valid.

Options:
a) $48
b) $52
c) $55
d) $60