Under what condition must an appliance license be reactivated?

A.
Licenses only have to be reactivated for RMAs – no other situations.
B.
Licenses generally have to be reactivated during system software upgrades.
C.
Licenses only have to be reactivated when new features are added (IPv6, Routing Modules, etc) – no
other situations.
D.
Never. Licenses are permanent for the platform regardless the version of software installed.