How do you upgrade the software of an existing installation with a Cisco TelePresence MCU 5300?
A. Download the new software, navigate to Maintenance > Upgrade Software, and upload the software.
B. Use FTP to access the MCU, browse to the /etc/software/upgrade directory, put the new load in, and reboot the MCU.
C. Navigate to Settings > Upgrade, then follow instructions under Main Software Image.
D. Use an SFTP client to log in to the MCU, and place the software in the /etc/software/upgrade directory.