What is the difference between the activities required to use the focused differentiation strategy and those of the industry-wide differentiation strategy? a. The activities required to use the focused differentiation strategy and those of the industry-wide differentiation strategy differ primarily in their pricing strategies. b. The industry-wide differentiation strategy does not require any primary value-chain activities. c. There is no difference in the activities required for the two strategies. d. The activities required for the focused differentiation strategy are largely different from those of the industry-wide differentiation strategy