The only signs, stickers or other material that may be displayed on the windshield of a school bus are those which are displayed in a _____ inch square in the lower corner of the windshield farthest removed from the driver or those displayed in a _____ inch square in the lower corner of the windshield nearest the driver.
a) 3, 5
b) 4, 6
c) 5, 7
d) 6, 8