You are trying to register an H.323-based Cisco TelePresence system to Cisco Unified Communications Manager and a Cisco DX70 system to the Cisco VCS Control. Why do neither of the units want to register?

You are trying to register an H.323-based Cisco TelePresence system to Cisco Unified Communications Manager and a Cisco DX70 system to the Cisco VCS Control. Why do neither of the units want to register?
A .  The
B . 323-based system needs an E164 number to register to Cisco Unified Communications Manager, and the Cisco DX70 needs to have the MAC address configured first on the Cisco VCS Control.
C .  The
D . 323-based system needs to register to the Cisco VCS Control with an
E . 164 number, and the Cisco DX70 needs the TFTP address to register on the Cisco Unified Communications Manager.
F .  Both systems need to register to the Cisco VCS Control, but the
G . 323-based system needs to have the gatekeeper setting set to "Direct."
H .  Both systems need to register to the Cisco Unified Communications Manager, as the Cisco VCS Control is used only for firewall traversal.
.  You need Cisco TelePresence Management Suite to register Cisco TelePresence systems.
.  You need Cisco TelePresence Server to register Cisco TelePresence systems.

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Answer: B