Which action must you perform before you update Cisco Unified Communications Manager using BAT?

Which action must you perform before you update Cisco Unified Communications Manager using BAT?
A. Create or edit a CMC or FAC CSV file and insert the file in BAT.
B. Put Cisco Unified CM in BAT service mode.
C. Temporarily disconnect all non-BAT related servers, such as Cisco Presence.
D. Enable promiscuous mode on the Cisco Unified CM BAT database.

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