What mechanism governs control of the E-Series storage premium features? (Choose the best answer.)

A.
simple password system

B.
special USB flash drive that must be inserted into the controllers

C.
small toggle switches on the controller boards inside the system

D.
key file obtained from vendor and passed to system via SANtricity

E.
online database requiring the controllers to access the internet to activate features

Explanation:
https://library.netapp.com/ecm/ecm_download_file/ECMP1394572 (p.67)