A car service charges a $4.75 flat rate in addition to $0.85 per mile. A customer wants to spend no more than $20 for a ride. Write an inequality to represent the situation, where m is the number of miles traveled.
a. 4.75 - 0.85m <= 20
b. 4.75m + 0.85 >= 20
c. 4.75 + 0.85m <= 20
d. 4.75m - 0.85 <= 20
