By default Centralized licensing messages between master and local controllers are sent ___________________.

By default Centralized licensing messages between master and local controllers are sent ___________________.
A . In the clear unencrypted since the master and local controllers already share IPSEC tunnels.
B . Using CPSec
C . Using IPSec site to site VPN tunnels
D . Encrypted using GRE
E . PAPI

Answer: A