Which statement describes a role of AXL communications in the BLF Plug-in Service of the Cisco UAC?

Which statement describes a role of AXL communications in the BLF Plug-in Service of the Cisco UAC?
A . The AXL communications allow registered attendants to log in to Cisco UCM and receive calls.
B . The AXL communications enable Device Resolution Manager to resolve the device statuses of operator and system devices.
C . The AXL communications is required after installation to verify that the specified CTI manager or managers and Cisco UAC versions match.
D . The AXL communications is required after installation to verify that the specified CTI manager or managers and Cisco UCM versions match.

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Answer: B