Which of the Following Statements Best Illustrates the Service-Dominant Logic

Which of the following statements best illustrates the service-dominant logic for marketing philosophy?

A) Marketing decision makers should know their firms' core competencies.
B) Marketing decision makers need to know how to precisely measure service satisfaction.
C) Marketing decision makers must be able to directly impact ROI.
D) The quality of internal service levels is more important than the quality of external service levels.
E) Service performance is more important than product quality.