With Cisco ONE, what happens when a customer refreshes hardware?

A: The customer can refresh hardware in the same tier and port software at no charge but must purchase new licenses for the next tier of hardware B: The customer can refresh or go to the next tier or hardware and port or upgrade software at no additional charge C: The customer must purchase entirely new software licenses D: The customer can refresh hardware in the same tier and port software at no charge, or go to the next her of hardware and just pay the difference for their software