Which of the Following Is an Advantage of Sampling Through

Which of the following is an advantage of sampling through the mail?

A) It offers a greater markup for the retailer than other sampling techniques.
B) It can take place in stores as well as at a variety of other venues such as concerts.
C) The marketer has control over where and when the product will be distributed.
D) The distribution system is unaffected by postal restrictions and increasing postal rates.
E) This sampling method is always used in combination with another sampling method.