Yanni Has Been with the Organization for 25 Years; Even

Yanni has been with the organization for 25 years; even though he hasn't been promoted, he is held in high regard by co-workers who ask for his ideas when trying to solve problems.It is agreed amongst his coworkers that "Yanni knows everything and everything around here!" Yanni possesses

A) no power.
B) referent power.
C) information power.
D) expert power.
E) legitimate power.