Which value should be changed when each Cisco UCM node does not allow for more than 5000 phones to be registered?

Which value should be changed when each Cisco UCM node does not allow for more than 5000 phones to be registered?
A . Maximum Number of Registered and Unregistered Devices service parameter on each node
B . Minimum Number of Phones service parameter on each node
C . Maximum Number of Registered Devices service parameter on each node
D . Maximum Number of Phones service parameter on the Publisher

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Answer: C