All of the following are assumptions of the industrial organization (I/O) model EXCEPT: a. organizational decision makers are assumed to be rational and committed to acting in the firm's best interests. b. resources to implement strategies are firm-specific and attached to firms over the long-term. c. most firms competing within an industry or within a segment of that industry are assumed to control similar strategically relevant resources and to pursue similar strategies in light of those resources. d. the external environment is assumed to impose pressures and constraints that determine the strategies that would result in above-average returns.