When one vehicle is used for more than one business purpose the __________.

a. Taxpayer must use the actual expense method for the vehicle.
b. Taxpayer must use the same method of claiming expenses for all business uses.
c. Taxpayer must allocate the expenses based on the ratio of each vehicle's miles to total miles for both vehicles.
d. Total mileage for each use would not include the mileage from the other business use.