For Aaker's three "must do" imperatives for brand portfolio strategy, we know that we must identify the strategic brands that will play a ______ role in supporting major businesses or product platforms going forward. A brand is said to have a "______ role" when it is the main determinant of the purchase decision and defines the use experience.

Group of answer choices

a, Passenger, follower

b. Follower. passenger

c. Influencer, influenced

d. Driver, driver