The Prescott Shovel Company wants to upgrade its Cisco Unity Express from a Cisco Unified CallManager Express integration to a Cisco Unified CallManager integration. Which statement is true?（）
A special hybrid license is required.
B. The Cisco Unity Express license must be changed.
C. The Cisco Unity Express license does not need to be changed.
D. The license file names are identical, which allows them to be interchanged as long as the module itself is not being upgraded.
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