A Cisco TelePresence VCS displays this alarm: "Root password is set to default." How can this security warning be addressed?

A Cisco TelePresence VCS displays this alarm: "Root password is set to default." How can this security warning be addressed?
A . Use the Cisco TelePresence VCS web user interface, choose Administration > User Settings, and change the root password.
B . Use SSH to log in to the Cisco TelePresence VCS as Administrator and issue the command xconfig root set passwd.
C . Use SSH to log in to the Cisco TelePresence VCS as Root, issue the command set password, and enter the new password when prompted.
D . Use SSH to log in to the Cisco TelePresence VCS as Root, issue the command passwd, and enter the new password when prompted.
E . Use the Cisco TelePresence VCS web user interface, choose Administration > System Settings, and change the root password.

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Answer: D