What can you explain to the customer about how Aruba protects the company’s investment?

A mid-sized customer is having trouble deciding between in a controllerless Aruba solution and a controller-based one.

What can you explain to the customer about how Aruba protects the company’s investment?
A . The same Aruba APs can be deployed in controllerless Instant mode and then later changed to controlled mode.
B . Aruba offers a buy-back program for controllerless Instant APs, making it cost effective to later deploy controlled APs.
C . There is no difference in features and capabilities between a controllerless and controller-based Aruba solution.
D . Aruba uses a cloud subscription-based licensing model for controllerless APs, and these licenses can be upgraded to controller licenses.

Answer: B