A Network Administrator of a company has been made aware of a problem with the telephone system, and contacts a few colleagues who have dealt with similar problems in the past.

Which Discipline in 8D Methodology describes the action of the Network Administrator?

A. D4

B. D3
C. D2
D. D1

Reference: http://www.brooks.com/my-brooks/suppliers/~/media/Files/Suppliers/Documents/5_Why_Root_Cause_Corrective_Actions.pdf