4. What factors, other than the number of units shipped, are likely to affect the companys shipping expense? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.)

a. Weight of the units shipped checked b. Distance traveled checked c. Sales commissions unchecked d. Trade discounts given to repeat customers unchecked e. Express shipping to meet a deadline