Which Statement Best Describes the Notion of Pay for Knowledge

Which statement best describes the notion of pay for knowledge systems?

A) There is little empirical evidence supporting the validity of competency-based pay models.
B) Competency-based pay models are usually associated with operational level roles.
C) Pay for knowledge requires very detailed job descriptions for every role in an organization.
D) Pay for knowledge fits well with classical management styles,requiring employee flexibility in skill sets.