Gamma, Inc., has struggled for industry dominance with Ardent, Inc., its main competitor, for years. Gamma has gathered and analyzed large amounts of competitive intelligence about Ardent. It has observed as much of the firm's internal functioning and technology as it can legally, yet Gamma cannot understand why Ardent has a competitive advantage over it. The source of Ardent's success is: Group of answer choices unfair. causally ambiguous. impregnable. non-substitutable.