C-Through,an Optics Manufacturing Company,wants to Focus on Relationship Marketing

C-Through,an optics manufacturing company,wants to focus on relationship marketing.In this case,which of the following strategies is the best for C-Through to market its products?

A) It can use social networking sites to advertise itself to businesses.
B) It can market its products through dealers.
C) It can set the price and other conditions of sale without negotiation.
D) It can use accessory equipment and major equipment.It can enhance satisfactory services.