You have been advised by a TAC engineer to update the firmware of your Cisco IP Phones in your Cisco Unified Communications Manager cluster. You must update just one test phone initially in production to test the new firmware before you update the other production phones.
Which action allows this process without any down time to the other production phones?
A. Modify the DHCP server to make a new scope that includes only the new test phone.
B. Initialize a separate Cisco Unified Communications Manager Express device and use the built-in TFTP server to update the test phone with the same firmware on the Cisco Unified CM cluster.
C. Initialize a TFTP server outside the Cisco Unified CM cluster to replicate the new firmware from the Cisco Unified CM cluster to the test phone.
D. Install the new firmware in the TFTP server, keep the current load in the device defaults, and modify the phone load name in the phone configuration to use the recommended firmware version.
