Which of the following is true?

Funnels and flywheels are two different ways of saying the same thing.
The funnel is a better business model than the flywheel because it enables you to compare the performance of one salesperson to another.
A flywheel is the best model for customer service teams, while a funnel is the best model for sales teams.
The flywheel is a better business model than the funnel because it takes into account the impact current customers have on future customers.

The correct answer is:

The flywheel is a better business model than the funnel because it takes into account the impact current customers have on future customers.