Gary Werner Sells a New Calibrated Filtering System Used to Eliminate

Multiple Choice

Gary Werner sells a new calibrated filtering system used to eliminate virtually all types of hazardous gas emissions in chemical plants.He requires the customer to send at least three employees to a two-day training course on the appropriate use and maintenance of the filtering system.Which of the following elements of the promotion mix would most likely be used to sell this filtering system? 

A)  Advertising
B)  Public relations
C)  Mass marketing
D)  Personal selling