The original and oldest form of direct marketing is

The original and oldest form of direct marketing is field sales call. In addition, field sales are the activity of selling a products or services of the company outside the office by field sales force, representative or team. In this method, a manager can release a memo to complete field sales force at least cost.

I would say letter d. administration, short working hours and excitement. administration because you manage your own business. you also have short working hours because you will decide. and of course, excitement because of the ups and downs of making your own business

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