Which two capabilities can be implemented in a custom application using the Cisco Unified IP Phone Services API? (Choose two.)

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Which two capabilities can be implemented in a custom application using the Cisco Unified IP Phone Services API? (Choose two.)
A . Authenticate the phone to the network.
B . Display corporate directory information.
C . Play multicast messages.
D . Upgrade phone firmware.
E . Create new phone devices.

Answer: CE