An update of the configuration using the Cisco CTL client not needed when _______.

An update of the configuration using the Cisco CTL client not needed when _______.

A.
a Cisco UnifiedCallManager has been removed

B.
an LSC of the IP phone is upgraded

C.
a security token is added to the system

D.
an IP address of the Cisco TFTP server has been changed

Explanation:
(Source: Configuring Cisco IP Telephony Authentication and Encryption)