How do the EC500 and Extend Call features primarily function within Communication Manager?

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How do the EC500 and Extend Call features primarily function within Communication Manager?

(Choose Two)
A . They enable calls to be extended to mobile or other external devices.
B . They provide automatic voicemail transfer.
C . They allow users to switch devices mid-call without interruption.
D . They encrypt calls when extended to an external device.

Answer: AC