Which of the following is your best choice to define your employees' skill in servicing your clients?

RELATIONSHIP MARKETING =======   

Yes, it is Relationship Marketing.

All are in favor of Relationship Marketing, I also personally  support your answers.

Mr. Sidvin shetty's view also very nice.  Communication is also an integral part of it.

Practically,   "interactive Marketing"  is hopefully  more productive and efficient employee skill ---- all other skills support this.

DEFINITELY RELATIONSHIP MARKETING.

I will go with option E- Relationship Marketing

Thank you

E. Relationship marketing

lets say E. Relationship marketing. thanks

Communication Marketing skills

The best choice would be  - Relationship Marketing. 

Frankly all of them.

Irrespective of which industry they belong. You need the combination of all that's why we need "SMARKETING" as Just 'Marketing' as a role has actually become outdated.

As an employee i expect my employees to have proper empathy & coordination with other departments, supplier's, distributor's thus : Internal Marketing is essential.

To communicate 'Bias - free' & appealing way to distinguish competing brands, highlight our product range benefits: He needs to have command in communication, Interactive & External Marketing skills.

To build the Existing customer base, convert leads to customer's , keep them happy in each interaction, understand their requirements, justify pricing i need them to have "A Relationship Marketing Skills " ...

Thus, everything is important to be competitive & be as well remain the 'Leader of great service of a great product' each time to every customer in the Industry & beyond .... :-)  

E would be easier for best choice.